Oakton EcoTestr pH1 Instruction Manual

Operating Manual

EcoTestr™ pH1 Pocket Tester

Keypad Functions

Short press = <2 seconds
Long press = >2 seconds

1. Short press to turn on; long press to
turn off.

MEAS

CAL

<

Calibration

1. For rst-time use or if the tester hasn’t been used for a
long time, pour some buffer/storage solution to the Fill
line in the probe cap, and soak probe for about 15 to

30 minutes to hydrate the pH sensor.

2. Short press

in a clean cup and use tissue paper to gently dab off
excess water.

3. Long press CAL/ to enter calibration mode; short press

/MEAS to exit.

Note: Always start calibration with pH 7.00 buffer.

4. Insert the probe in pH 7.00 calibration
solution, stir gently, and leave it to stand.
Wait for the measurement stability icon ()

to appear and stay on the display (see Fig 1);

then short press CAL/ to complete the 1st
calibration. Tester returns to measurement
mode, and the calibration icon “M” appears
on bottom left side of display.

5. Rinse probe in distilled water. Long press CAL/ to enter
calibration mode. Insert the probe in pH 4.00 calibration
solution, stir gently, and let it stand. Wait for the stability

2. When turned off, long press to enter
setup mode.

3. In mode setting, short press to change
parameter.

1. When turned on, long press to enter

calibration mode.

2. In calibration mode, short press to
confirm calibration.

3. In mode setting, short press to confirm
parameter selection.

/MEAS to turn on. Rinse in distilled water

pH





Figure 1

6.6

7

icon () to appear and stay on the display; then short
press CAL/ to complete the 2nd point calibration. Tester
returns to measurement mode, and calibration icons
“L” and “M” will appear on bottom left side of display.

Notes:

• Tester will automatically recognize pH buffer solution.

Users can choose 1, 2, or 3 calibration points. The 1st

calibration must be in a calibration solution of pH 7.00,

then followed by the 2nd or 3rd calibration. For details,
please refer to the following table:

Calibration Solutions

1-point pH 7.00 M Accuracy ≥0.1 pH

pH 4.00

2-point

3-point

and 7.00

pH 7.00

and 10.01

pH 4.00, 7.00,

and 10.01

Indication

icons

L M Range <7.0 pH

M H Range >7.0 pH

L M H

Recommended

Wide measuring

Measurement

1. Short press /MEAS to turn on the tester. Rinse in
distilled water in a clean cup and use tissue paper to
gently dab off excess water.

2. Stir probe in sample solution, leave it to stand. Wait for

the stability icon () to remain on, then take a reading.

Notes:

• If you see some white crystalline solid leaked out of the

pH probe, that’s the reference solution (3M KCL) inside

the probe. It is NOT a sign of any defective issue. It is a
normal phenomenon when the probe is stored dry for a
period of time. It proves that the junction of the probe is
working well. Users can simply rinse the probe in distilled

pH

water to remove the solids and use the tester as usual.

• After each test, user should rinse the pH probe thoroughly

with distilled water or purified water.

• When using premixed pH calibration buffer solutions, we

recommend replacing the solution after 10 to 15 times of

use to maintain accuracy.

• This tester will NOT give accurate or stable pH readings

when testing distilled or deionized water. This is because

accuracy

and range

range

distilled or deionized water do not have enough ions pres­ent for the electrode to function properly. To measure the
pH of distilled or deionized water, users need to use a
specialized instrument. When testing purified water like
spring water or drinking water, it will take longer for the
readings to stabilize (typically 3 to 5 minutes) because
there are very few ions left to be detected by the sensor.

• Do NOT store probe in purified water because that will

cause permanent damage to the pH probe. Purified water
is only recommended for rinsing the probe. The probe
should be stored in 3M KCL pH electrode storage solution
for best accuracy or stored in the pH 4.00 calibration solu­tion as an alternative if storage solution is not handy.

• Storing the probe dry will NOT cause permanent damage

to it. It will only temporarily cause the probe to lose its
sensitivity, which can always be restored by soaking in
the storage solution or pH 4.00 calibration solution.

Setting the Parameters

When tester is off, long press /MEAS to enter setup mode.
Short press

press CAL/ and parameter will flash, then short press

/MEAS to choose desired parameter. Short press CAL/ to
confirm parameter selection. Long press
to measurement mode.

Symbol Menu setting Selection Factory default

P1 Select pH buffer USA – NIST USA

P2

P3

Notes:

• There are two types of possible standard pH buffer

solutions (P1):

Three-

point

calibration

/MEAS to switch from P1 to P2 to P3. Short

/MEAS to return

Select temperature

unit

Restore to factory

default

Icons

L

M 7.00 pH 6.86 pH

H

pH standard buffer solution series

USA series NIST series

1.68 pH or

4.00 pH

10.01 pH or

12.45 pH

°F – °C °C

No – Yes No

1.68 pH or

4.01 pH

9.18 pH or

12.45 pH

1065O101_MAN_pH1_35634-05.indd 1 03/22/2018 4:01:50 PM

Self-Diagnostic Messages

Symbol

Self-diagnosis

information
Wrong pH

calibration
solution, or
measured value
is not within the
range of
the tester.

Er 1

Calibration
order not
performed
correctly.

CAL/ is
pressed before

Er 2

* If you find any air bubble in the glass bulb of the pH sensor, simply invert

the probe for a few times to remove it. The existence of an air bubble in the
glass bulb will significantly decrease the accuracy of measurement.

measurement
is stable
( appears
and stays)

How to fix

• Check if calibration
solution is correct.

• Check if probe is damaged.

• Check if there is any air

bubble in the glass bulb
sensor.*

The 1st point calibration

must be pH 7.00. Perform

the 2nd point calibration (pH

4.00) immediately after the

1st point. Do NOT turn off

the tester until user conducts

the 2nd point calibration,

otherwise user will need to
restart the process with the

1st point calibration.

Wait for the measurement
stability icon () to appear
and stay, then press CAL/ .

IP rating: IP67 (waterproof), oats on water when sensor cap

is on

Dimensions (L x W x H): 7" x 1.5" x 1.25" (17.8 x 4 x 3.1 cm)
Weight: 3.8 oz (107 g)

Ordering Information

Model Product description Catalog number

pH1 EcoTestr pocket pH tester 35634-05

Battery Installation

The tester uses four AAA batteries. Please install batteries

according to the following steps. Note the correct direction
of battery installation: the positive side (+) of every single

battery must face up. Incorrect installation of batteries will
cause damage to the tester and create a potential hazard.

4 x AAA Batteries

2

1

3

+

+

_

_

+

+

_

_

5

7

4

6

Warranty

We warrant this instrument to be free from defects in
material and workmanship and agrees to repair or replace
free of charge, at option of Oakton Instruments, any
malfunctioned or damaged product attributable to
responsibility of Oakton Instruments, for a period of
two years from the delivery (a six-month limited warranty
applies to probes). This warranty does not apply to
defects resulting from actions such as misuse (violation
of the instructions in this manual or operations in the
manner not specified in this manual), improper mainte­nance, and unauthorized repairs. Warranty period is the
time limit to provide free service for the products
purchased by customers, not the service life of the tester
or probe.

Oakton Instruments reserves the right to update the
information in this manual without giving notice in
advance.

Specifications

Range 0 to 14.0 pH

Resolution 0.1 pH

pH

Accuracy ±0.1 pH
Calibration points 1, 2, or 3 points

Temperature

Automatic temperature
compensation

Range

Resolution 0.1°F/°C

32 to 122°F

(0 to 50°C)

32 to 122°F

(0 to 50°C)

Accuracy ±0.9°F (0.5°C)

Power: four AAA batteries (included); >400 hours of
continuous operation

Low-voltage warning:

battery status icon flashes

Auto power-off: tester automatically turns off after 8 minutes

of nonuse

1065O101_MAN_pH1_35634-05.indd 2 03/22/2018 4:01:52 PM

1. Pull the battery cap up.

2. Slide the battery cap along the direction of arrow.

3. Open the battery cap.

4. Insert the batteries (ALL POSITIVE SIDES FACING UP).

5. Close the battery cap.

6. Slide and lock the battery cap along the direction of

arrow.

7. Fit the tester’s cap while making sure to push all the
way down. The tester’s waterproof design may be

compromised if the cap is not fitted correctly.

www.4oakton.com

1065O101_MAN_pH1_35634-05 March 2018