
User Manual
UTG300
Ultrasonic Thickness Gauge
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1. Overview
Congratulations on your purchase of the Triplett UTG300
Ultrasonic Thickness Gauge. This product is an intelligent
ultrasonic thickness gauge that adopts the latest high
performance and low power consumption microprocessor
technology. Based on the principle of ultrasonic
measurement, it can measure the thickness and sound
speed of metal and other materials. It can detect the thinning
of pipes and pressure vessels after corrosion, and can make
accurate measurements of plates and machined parts. The
gauge can be widely used in petroleum, chemical,
metallurgy, shipbuilding, aviation, aerospace and other
fields.
1.1 Operating Principle
When measuring the thickness, the ultrasonic pulse is
generated by the probe to reach the measured body
through the coupling agent. Part of the ultrasonic signal is
reflected from the bottom of the object, and the probe
receives the reflected echo. The gauge calculates the
round trip time of the ultrasonic wave and the thickness
value according to the following formula, and then
displays the calculated results.
In the formula: H-Measured thickness; V-Material sound
velocity; t-Round trip time of ultrasonic wave in specimen
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2.4" monochrome dot matrix screen
H<10mm, ±0.1mm, H is the actual
Lower limit of pipe measurement
300 groups, including material, sound
velocity, unit, measured value, MAX,
MIN and AVG of each group
Single measurement, continuous
measurement, alarm, sound velocity
measurement, auto calibration
Built-in 3.7V 2000mAh lithium battery
DC5V 1A, Type-C interface
Operating time (full battery)
Operating temperature and humidity
Storage temperature and humidity
Note: 1) Oil coupling agent cannot be used for the
standard probe, otherwise the probe will be damaged.
After using the probe, please wipe the residual coupling
agent on it to extend its service life.
2) Please avoid using the product in oily environment
as far as possible. If unavoidable, minimize the contact
time with oily substances, and wipe the probe
surface with oil-absorbing paper after use.
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2. Structure and Appearance
4
Product features
5
3
2
1
Single
20.00 mm
ULTRASONIC THICKN ESS GAUG E
6. Standard thickness block
7. Probe
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2.1 Main Interface
After the gauge is turned on, it will automatically enter
the main interface, as shown below:
6
3
3. Battery Charging and Maintenance
The product is equipped with a non-removable
3.7V 2000mAh lithium battery.
When the product cannot be turned on or the battery
is empty, please charge it in time.
Charge the product with a DC5V adapter larger than
1A and the charging interface is Type-C.
When charging, the battery icon scrolls
. When
fully charged, the battery icon becomes full .
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Note: When not in use for a long time, the product should
be fully charged and recharged every six months to
avoid battery damage.
4. General Measurement Process
5. Preparation
5.1 Treatment of Measured Workpiece Surface
If the measured object surface is rough or
seriously rusted, please use the following methods:
●Use coupling agent on the measured object surface
●Use rust remover, wire brush or sandpaper to treat
the surface
●Multiple measurements near the same point
6. Operation
6.1 Power On/Off
Insert the probe into the gauge and short press
to
power on.Long press
to power off.
Auto power off: The product will shut down automatically
when there is no operation. The default time is 5 minutes.
Users can select the auto power off time, refer to 6.18 Power Off.
Force shutdown: Long press the Power button for more than 10s.
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6.2 Single Measurement
Evenly smear the coupling agent on the area to be
measured. Tightly couple the probe to the material
surface, and the thickness of the measured area will
show on the screen. When the probe is well coupled to
the material, the screen will display the coupling symbol
. If the coupling symbol flickers or there is no
coupling symbol, it indicates that the coupling condition
is bad and the coupling agent needs to be added. After
the probe is removed, the coupling symbol disappears
and the thickness value remains.
Figure 1 Add the coupling agent
Figure 2 Evenly smear the coupling agent and
tightly couple the probe to the material surface.
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6.3 Continuous Measurement
Evenly smear the coupling agent on the area to be
measured and couple the probe to the material surface.
Move the probe along the surface. The gauge will
display the current measured value, MAX, MIN and AVG
in real time.
6.4 Alarm
Users can monitor the unqualified materials with the
alarm function. Long press
to turn on/off the alarm.
If is displayed on the screen, the alarm is turned on.
If is displayed on the screen, the alarm is turned off.
For example:
Standard value: 4.00mm, limit: ±0.1mm. When the
measured thickness is less than 3.90mm or greater than
4.10mm, the gauge will give an alarm sound, indicating that
the thickness is not qualified. Users can press any button to
exit the alarm, or continue measuring.
6.5 Calibration
Note: Calibration should be carried out when the probe
is replaced, the ambient temperature changes greatly
or the measurement deviation occurs.
Calibrate the gauge if it is used for the first time or not
used for a long time. Calibration must be done using
the standard thickness block. After calibration, the
material automatically changes to steel, and the sound
velocity changes to 5920m/s (0.233in/us).
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Calibration steps:
1) Long press
to enter the calibration mode.
"Please Calibrate" will show on the screen.
2) Refer to Figure 1 and Figure 2 in 6.2 Single
Measurement to evenly smear the coupling agent on
the surface of the standard thickness block. Press
the probe on the coupling agent to make it tightly contact
with the block surface. (Note: the coupling agent should
not be too thick. Otherwise the gauge will count the
thickness of the coupling agent, resulting in calibration
errors).
3) Press to save the calibration data. (Note: Before
pressing , the value displayed might not be 4mm. When
the value is stable, press . After calibration, the displayed
value should be within the range of 4±0.04mm,
otherwise recalibrate).
6.6 Sound Velocity Measurement
Different materials have different sound velocities. The
materials and velocities listed in Appendix A are for r
eference only.This function is used to measure the sound
velocities of materials. The steps are as follows:
1) First calibrate the gauge.
2) Use a caliper to measure the thickness of
the workpiece.
3) Use the gauge to measure the thickness of the
workpiece.
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4) Press
or to make the thickness measured by
the gauge the same as the value measured by the caliper.
5) Press
to calculate the workpiece sound velocity.
6) At this point, the correct sound velocity can be obtained,
and the correct thickness can be obtained by measuring
the same material with the sound velocity.
Note: The thickness adjustment range is ±20mm
(±0.79in) (for customized materials, ±250mm
(±9.84in)). The upper limit is 300mm, and the lower
limit is 1mm. In case of misoperation, users can refer to
6.7 Sound Velocity Selection.
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6.7 Sound Velocity Selection
Users can select the sound velocity according to the
material. When the current unit is mm, the unit of
sound velocity is m/s. When the unit is in, the unit of
sound velocity is in/us. In the main interface,
short press
to select the material. The gauge has
three types of custom materials. If users do not know
which material to select, they can select the custom
materials and then measure the sound velocity of the
material, refer to 6.6 Sound Velocity Measurement.
Material selection interface
MAT 1) Press to step through the
options upwards.
Press to step through the
Press to confirm the selected
material and enter the sound velocity
Press to return to the main
interface.
Sound velocity adjustment interface
SPD
Adjust range
5720 - 6120
5920m/s
1) Press
to add the value. Long
press it to scroll up.
2) Press to subtract the value.
Long press it to scroll down.
3) Press to confirm the sound
velocity and return to the main
interface.
4) Press to return to the
material selection interface.
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6.8 Clear Measured Results
In the single and continuous measurement interfaces,
short press
to clear the current measured results
(including MAX, MIN and AVG). In the continuous
measurement mode, the results can only be cleared
after the probe is removed.
6.9 Data Storage
In the single and continuous measurement interfaces,
long press to save records. Each record includes the
current measured value, MAX, MIN, AVG and material
sound velocity. A maximum of 300 groups of data can
be stored. To view and delete records, refer to 6.14
Records. In the continuous measurement mode, the
data can only be saved after the probe is removed to
avoid storing unstable data.
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6.10 Menu
Long press
to enter the menu. The options
include Material, Speed, Unit, Records, Setting,
About and Reset.
Menu
Material
Speed
Unit
Records
Setting
About
Reset
1) Press
to step through the
options upwards.
2) Press
to step through the
options downwards.
3) Press to enter the interface of
the selected option.
4) Press
to exit the menu and
return to the main interface.
6.11 Material
In the material selection interface:
MAT
1) Press
to step through the
materials upwards
2) Press
to step through the
materials downwards.
3) Press to confirm the selected
material and return to the menu.
4) Press
to return to the menu.
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6.12 Speed
The default value is ±200m/s (0.008in/us). The
adjustment range of custom materials is 1000m/s
to 9999m/s (0.039in/us to 0.394in/us).
SPD
5920m/s
1) Press
to add the value. Long
press it to scroll up.
2) Press to subtract the value.
Long press it to scroll down.
3) Press to save and return to the
menu.
4) Press
to return to the menu.
6.13 Unit
In the unit selection interface:
Unit
0.1mm
0.01mm
0.01in
1) Press
to step through the
units upwards.
2) Press
to step through the
units downwards.
3) Press to save and return to the
menu.
4) Press
to return to the menu.
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6.14 Records
In the menu, select "Records" and press to enter the
records interface. When there is no record, the screen
will display "No records", and the gauge cannot enter
the records interface.
Records
first page last
page selected
item Delete the
item Delete all
1) Press
to step through the
options upwards.
2) Press
to step through the
options downwards.
3) Press to enter the interface of
the selected option.
4) Press
to return to the menu.
6.14.1 First Page
Select "First page" and the screen will display the
records from the first page. The number and value of
each record will also be displayed.
Records
1 4.50mm
2 4.44mm
3 4.42mm
1) Press
to page up.
2) Press to page down
3) Press
to select a record.
4) Press
to return to the
records interface.
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When a record is selected, press
through the records upwards or
to view the detailed information of
the selected record (NO., measured value, MAX, MIN
and AVG). Short press
to return to the record list.
Records
001
4.50 mm
Mat
Custom1 5920
Max 4.50mm
Min 4.50mm
Avg 4.50mm
When viewing a record, users can long press to
delete this record. Press
or to view the
previous or next record.
6.14.2 Last Page
Select "Last page" and the screen will display the
records from the last page. The number and value
of each record will also be displayed, refer to 6.14.1
First Page.
6.14.3 Selected Item
In the records interface, select "Selected item" to
choose a record to be viewed. The screen will display
the record list starting from the page where the selected
record is located. The number and value of each record
will also be displayed.
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Select group
Select group From
001 to 009
001
1) Press
or to adjust the
record number.
2) Press to confirm the adjusted
digit (tens digit/tens digit/ units digit).
After the units digit is confirmed, it
will enter the page where the
selected record is located.
3) Press to return to the records
interface.
6.14.4 Delete the Item
In the records interface, select "Delete the item" to
choose the record to be deleted.
Del Group
group range
( 001-009)
From 001to001
1) Press
or to adjust the
record number.
2) Press to confirm the adjusted
digit (tens digit/tens digit /units
digit). After the units
digit is confirmed, a prompt will
pop up.
3) Press to return to the
records interface.
When the prompt pops up, users can press
or
to select Yes/No, and then press to delete or not.
Press
to return to the previous interface.
Del
Delete
001-001
Yes No
Deleting records takes a while.
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6.14.5 Delete All
In the records interface, select "Delete all" to delete all
records. Press
or to select Yes/No, and then
press to delete or not. Press to return to the records
interface.
Del
Do you confirm to
Delete all Saved
data?
Yes No
6.15 Setting
In the setting interface:
Setting
Sound
Back light
Power off
Alarm
Language
1) Press
to step through the
options upwards.
2) Press
to step through the
options downwards.
3) Press
to enter the interface
of the selected option.
4) Press
to return to the menu.
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6.16 Sound
In the sound interface:
sound
ON OFF
1) Press
or to select ON/OFF.
2) Press
to save.
3) Press
to return to the setting
interface.
6.17 Backlight
In the backlight interface:
1) Press
to add the backlight
time.
to subtract the backlight
6.18 Power Off
In the power off interface:
Shut
Time 300S
1) Press
to add the power off time.
2) Press
to subtract the power off
time.
3) Press
to confirm.
4) Pressto return to the setting
interface.
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6.19 Alarm
In the alarm interface, first adjust the standard value,
and then adjust the limit. Long press or to quickly
adjust the value.
Alarm
Standard 4.00mm
Limit ±0.01mm
6.20 Language
1) Press
to add the
standard/limit.
2) Press
to subtract the
standard/limit.
3) Press
to confirm.
4) Press to return to the setting
interface.
In the language interface:
Language
Chinese
English
1) Press
to step through the
options upwards.
2) Press
to step through the
options downwards.
3) Press
to save.
4) Press to return to the
setting interface.
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6.21 About
Press
to return to the setting interface in the about
interface.
The content will be updated later. The actual situation
prevails.
About
ID: UTG China
Version:V.202204
6.22 Reset
In the reset interface:
Reset
Do you need to
restore Factory
settings ?
Yes NO
1) Press
or to select Yes/No.
2) Press
to confirm.
3) Press
to return to the setting
interface.
7. Measurement Applications
7.1 Measurement Modes
●Single point measurement: Use the probe to measure
any point of the measured object. The displayed value
is the thickness.
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●Two-point measurement: Use the probe to measure
the same point of the measured object twice. The
probe parting plane is 90°, and the smaller value is the
thickness.
●Multi-point measurement: Multiple measurements are
made in a circle with a diameter of about 30mm, and
the minimum value is the thickness.
●Continuous measurement: Continuously measure
along a specified route with the single point method.
The distance between each point is not less than
5mm, and the minimum value is the thickness.
7.2 Tube Wall Measurement
The probe split surface can measure along the axis
of the pipe or the axis of the vertical pipe. If the pipe
diameter is large, the measurement should be in the
direction of the vertical axis. When the pipe diameter
is small, it should be measured in both directions,
and take the minimum value as the thickness.
8. Maintenance and Cautions
8.1 General Cautions
●The gauge and probe should be avoided from strong
vibration.
●Do not place the gauge in a damp environment.
●Do not rotate the probe when inserting or
removing it to avoid damaging the cable core.
●The attachment of oil and dust will make the probe
cable gradually aging and fracture. After use, the dirt on
the cable should be removed.
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8.2 Cautions during Measurement
●Good measurements are made only when stable
coupling symbol appears;
●When there is a large amount of coupling agent on
the object surface, it will cause mismeasurement.
Therefore, at the end of the measurement, the
probe should be quickly removed from the surface.
●The probe surface is acrylic resin and should be
gently pressed when used. When measuring rough
surface, try to reduce the probe scratching on it.
●When measuring at room temperature, the surface
of the measured object should not exceed 60℃,
otherwise the probe can no longer be used.
●If the probe wears, the indicating value will be
unstable. Please replace it.
8.3 Clean the Standard Thickness Block
The standard thickness block should avoid rust.
Wipe the block after use, and don't come into
contact with sweat. If not used for a long time,
a little grease should be coated on the surface of
the block, and the grease can be wiped after the
next use.
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8.4 Clean the Outer Shell
Alcohol and diluent have corrosive effect on the casing,
so wipe it gently with a wet cloth.
8.5 Repair
When there are problems with the gauge (such as inability
to measure, abnormal LCD display, large error and button
operation failure or confusion), please do not disassemble
or adjust any parts, and contact after-sales.
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Appendix A Material Sound Velocity
Note: The sound velocities listed are
approximate and are for reference only.
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Appendix B FAQ and Solutions
B.1 Influence of Surface Conditions on Measurement
Results
B.1.1 Surface Coverings
Before measurement, remove dust, dirt, rust, paint and
other coverings on the object surface.
B.1.2 Rough Surfaces
Too rough surface can cause error, or even no reading.
The material surface should be as smooth as possible.
Grinding, polishing, filing and other methods are helpful,
and a high-viscosity coupling agent can also be used.
B.1.3 Roughwrought Surfaces
Regular grooves created by roughwrought surfaces
(such as lathes or machines) can also cause errors, as
described above. In addition, adjust the angle between
the probe partition board (through the bottom center of
the probe metal thin layer) and the measured material
groove, so that the partition board and the groove are
vertical or parallel to each other. Take the minimum
value as the thickness.
B.1.4 Cylindrical Surfaces
When measuring cylindrical materials, such as pipes,
oil drums, etc., it is very important to correctly choose
the included angle between the probe partition board
and the axis of the measured material. The probe is
coupled with the measured material, and the probe
partition board is parallel or perpendicular to the
material axis. Slowly shake the probe vertically along
the axis, and the reading on the screen will change
regularly. Take the minimum value as the thickness.
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Select the angle between the probe partition board and
the axis according to the curvature of the material. For
pipe with large diameter, the probe partition board is
perpendicular to the pipe axis. For pipe with small
diameter, the probe partition board is perpendicular or
parallel to the pipe axis. Take the minimum value as the
thickness.
B.1.5 Composite Shapes
The method described above can be used when
measuring materials with composite shapes (such as
pipe elbows). The difference is that two measurements
are made, reading the probe partition and axis
perpendicular and parallel values respectively. Take
the smaller value as the thickness.
B.1.6 Unparallel Surfaces
To obtain a stable and reliable value, the other
surface of the material must be parallel or coaxial to
the measured surface.
B.2 Influence of Temperature on
Measurement Results
The thickness and the velocity of ultrasonic wave in the
material are affected by temperature. When higher
accuracy is needed, the blocks with the same material
and approximate thickness can be measured under the
same temperature. The temperature compensation
coefficient can be obtained, and the measured value of
the workpiece can be corrected with this coefficient.
B.3 Influence of Material Attenuation on
Measurement Results
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Fiber, porous, coarse crystal materials will cause a lot of
ultrasonic scattering and energy attenuation, so that the
gauge may have abnormal reading or no reading
(abnormal reading is usually less than the actual
thickness). In this case, the material is not suitable for
measurement with this gauge.
B.4 Reference Blocks
The closer the material of the calibrated block is to the
measured material, the more accurate the measurement
will be. An ideal reference block would be a set of
blocks of different thicknesses of the measured material,
which would provide instrumental compensatory
correction factors (such as material microstructure, heat
treatment conditions, particle orientation, surface
roughness, etc.). In most cases, satisfactory
measurement accuracy can be obtained by using only
one reference block. The block shall be of the same
material and of a similar thickness as the measured
material. The uniform material can be used as a block
after measuring with a micrometer.
For thin materials, a block may be used to determine the
exact lower limit when its thickness approaches the lower
limit measured by the probe. Do not measure material
below the lower limit of thickness. If the thickness range
is estimable, the thickness of the block shall be the upper
limit. When the material to be tested is thick, especially
the alloy with a complex internal structure, one of the
blocks close to the measured material should be
selected to facilitate calibration.
The internal structure of most forgings and castings is
directional. The sound velocity will vary in different
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directions. To solve this problem, the test block should
have an internal structure in the same direction as the
measured material, and sound waves should travel in the
same direction in the test block as in the material.
In certain cases, the reference block can be replaced by
the sound velocity table of the known material. But this
is only approximating the substitution of some reference
blocks. In some cases, the values in the sound velocity
table differ from the actual measurements because of
differences in the physical and chemical conditions of
the material. This method is often used to measure mild
steel, but only as a rough measurement. This gauge has
the function of measuring the sound velocity, so it can
measure the sound velocity first, and then measure the
workpiece with the sound velocity.
B.5 Casting Measurement
The grain size of casting material is coarse and the
structure is not dense enough, which will cause great
attenuation of sound energy. In addition, the
measurement is often carried out in the state of wool, so
it is difficult to measure. The degree of attenuation is
closely related to grain size and ultrasonic frequency. At
the same frequency, the attenuation increases with the
increase of grain diameter, but when it exceeds the
highest point, the attenuation tends to a fixed value. For
probes with different frequency, the attenuation
increases with the increase of frequency. When the
coarse grain and casting in the presence of coarse
heterogeneous structure, the ultrasonic signal will
produce abnormal reflection, grass echo or tree echo,
resulting in the
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reading error.
Coarse grain size and inconsistent densification of
tissues at different positions in the workpiece will
cause differences in sound velocity and make the
measurement results inaccurate.
Note:
● When measuring the casting with rough surface,
a coupling agent with high viscosity must be used.
● It is recommended to calibrate the sound velocity
of the material with a block of the same material and
direction as the measured object.
B.6.4 Probe Wear
The probe surface is acrylic resin. Long-term use will
increase its roughness, resulting in a decrease in
sensitivity. If the probe is badly worn, sandpaper or
whetstone can be used to smooth the surface. If the
measured value is still unstable, replace the probe.
B.6.5 Multilayer and Composite Materials
It is impossible to measure multilayer materials with
incompact bonding surfaces because ultrasonic waves
cannot penetrate uncoupled surfaces. Ultrasonic waves
cannot spread at uniform speed in composite materials,
so the gauges measuring thickness by ultrasonic
reflection principle are not suitable for measuring
multilayer and composite materials.
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B.6.6 Influence of Oxide Layer on Metal
Surface
Some metals, such as aluminum, have a dense oxide
layer on their surfaces. This oxide layer is closely
bonded with the matrix, but the spread speeds of
ultrasonic wave in these two substances are different,
so it will cause error. Please pay attention to this
condition when using. Users can select a sample block
from the same batch of measured materials, measure
its thickness with micrometer or caliper, and calibrate
the gauge with this sample block.
B.6.7 Abnormal Thickness Reading
Operators should be able to identify abnormal
readings, which are usually caused by rust spots,
corrosion pits, and internal defects. Solutions can be
found in the relevant sections of this manual.
B.6.8 Selection and Use of Coupling Agents
The coupling agent is used as the carrier of ultrasonic
signal spread between the probe and the measured
material. If the type or use method of coupling agent is
improper, it may cause error, or the coupling symbol
flickers, and the measured value cannot be stable. The
coupling agent should be applied in appropriate amount
and coated evenly. Low viscosity coupling agents can be
used on smooth surfaces. High viscosity coupling agents
can be used on rough, vertical and top surfaces.
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B.7 Methods for Reducing
Errors B.7.1 Ultra-Thin Materials
With any ultrasonic thickness gauge, errors will occur
when the measured material thickness falls below the
lower limit of the probe.
When measuring ultra-thin materials, a false result called
"double refraction" sometimes occurs: the reading is
twice as thick as it actually is. Another type of false result
is called "pulse envelope, cycle jump": the measured
value is greater than the actual thickness. In order to
prevent such errors, the ultra-thin material
measurements should be checked repeatedly.
B.7.2 Rust Spots and Corrosion Pits
Rust pits on another surface of the measured material
(small rust spots are sometimes difficult to detect) will
cause irregular changes in the reading and in extreme
cases no reading at all. When pits are found, this area
should be measured with great care. Multiple
measurements can be performed by selecting the
orientation of the probe partition board at different
angles.
B.7.3 Material Identification Error
When the gauge is calibrated with one material and then
measures another, the wrong result will be obtained.
Please select the correct sound velocity.
-31-
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Warranty
Triplett / Jewell Instruments extends the following warranty to the original
purchaser of these goods for use. Triplett warrants to the original purchaser for
use that the products sold by it will be free from defects in workmanship and
material for a period of (1) one year from the date of purchase. This warranty
does not apply to any of our products which have been repaired or altered by
unauthorized persons in any way or purchased from unauthorized distributors
so as, in our sole judgment, to injure their stability or reliability, or which have
been subject to misuse, abuse, misapplication, negligence, accident or which
have had the serial numbers altered, defaced, or removed. Accessories,
including batteries are not covered by this warranty
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