Klein Tools MM720 User manual

ENGLISH

1000V

10A

60M

Auto-Ranging

Digital Multimeter

INSTRUCTION MANUAL

True RMS

Measurement
Technology

• HIGH VISIBILITY
DISPLAY

• DATA HOLD

• LOW IMPEDANCE

• AUDIBLE CONTINUITY

• MIN / MAX / RELATIVE

• TEMPERATURE

• DIODE TEST

• CAPACITANCE &
FREQUENCY

Ω

MM720

2m IP42

ESPAÑOL pg. 19
FRANÇAIS p. 37

5000573

CAT IV
600V

CAT III
1000V

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GENERAL SPECIFICATIONS

Klein Tools MM720 is an automatically ranging true root mean square
(TRMS) digital multimeter that measures AC/DC voltage, AC/DC current,
and resistance. It can also measure temperature, capacitance, frequency,
duty-cycle, test diodes and continuity. It features a high visibility, reverse
contrast LCD display with an optical sensor to automatically optimize
viewability in dark or bright ambient lighting.

• Environment:

• Operating Altitude: 6562 ft. (2000m)

• Relative Humidity: <90% non-condensing

• Operating Temp: 14°F to 122°F (-10°C to 50°C)

• Storage Temp: -4°F to 140°F (-30°C to 60°C)

• Accuracy: Values stated at 65°F to 83°F (18°C to 28°C)

• Temp Coef cient: 0.1 x (Quoted Accuracy) per °C above 28°C

or below 18°C, corrections are required when ambient working
temp is outside of Accuracy Temp range

• Dimensions: 6.94" × 3.37" × 1.88" (176.3 × 85.7 × 47.7 mm)

• Weight: 12.2 oz. (345 g)

• Calibration: Accurate for one year

• Standards: Conforms to: UL STD 61010-1, 61010-2-030,

61010-2-033.

Certified to: CSA STD C22.2 # 61010-1,
61010-2-030, 61010-2-033.

EC EN 61010-1, 61010-2-030,
61010-2-033, 61326-1.

• Pollution degree: 2

• Accuracy: ± (% of reading + # of least significant digits)

• Drop Protection: 6.6 ft. (2m)

• Ingress Protection: IP42 (see WARNINGS)

• Safety Rating:

Double insulation

Indoor. DO NOT expose to moisture, rain, or snow.

CAT IV 600V, CAT III 1000V, Class 2,

CAT III: Measurement category III is applicable to test and

measuring circuits connected to the distribution part of the
building’s low-voltage MAINS installation.

CAT IV: Measurement category IV is applicable to test and

measuring circuits connected at the source of the building’s low­voltage MAINS installation.

• Electromagnetic Environment: IEC EN 61326-1. This

equipment meets requirements for use in basic and controlled
electromagnetic environments like residential properties,
business premises, and light-industrial locations.

Specifications subject to change.

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ELECTRICAL SPECIFICATIONS

VOLTAGE (AUTO-RANGING)

Function Range Resolution Accuracy (

6.000V 1mV

AC Voltage

(V AC)

DC Voltage

(V DC)

Input Impedance: 10MΩ
Frequency Range: 50 to 400Hz
Maximum Input: 1000V AC RMS or 1000V DC

600.0V 100mV
1000V 1V

600.0mV 0.1mV

60.00V 10mV

600.0V 100mV
1000V 1V

±(1.0% + 3 digits)60.00V 10mV

±(1.2% + 5 digits)

±(0.5% + 5 digits)6.000V 1mV

±(0.8% + 3 digits)
±(1.0% + 3 digits)

CURRENT (AUTO-RANGING)

600.0μA 0.1μA
6000μA 1μA

AC Current

(μA and mA)

DC Current

(μA and mA)

Overload Protection: 800mA/1000V and 10A/1000V fuses
Frequency Range: 50 to 400Hz
Maximum Input: µA/mA setting: 600mA AC RMS / DC
10A setting: 10A AC RMS / DC

60.00mA 10μA

600.0mA 100μA

6.000A 1mA

10.00A 0.01A

600.0μA 0.1μA
6000μA 1μA

60.00mA 10μA

600.0mA 100μA

6.000A 1mA

10.00A 0.01A

±(1.0% + 5 digits)

±(2.0% + 3 digits)
±(2.0% + 5 digits)

±(1.0% + 3 digits)

±(1.5% + 3 digits)

RESISTANCE (AUTO-RANGING)

Function Resolution Accuracy

600.0Ω 0.1Ω

6.000kΩ 1Ω

60.00kΩ 10Ω

600.0kΩ 100Ω

6.000MΩ 1kΩ

60.00MΩ 10kΩ

Maximum Input: 600V DC or 600V AC RMS

±(1.2% + 5 digits)

±(2.0% + 10 digits)

50–60 Hz

)

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ELECTRICAL SPECIFICATIONS

CAPACITANCE (AUTO-RANGING)

Range Resolution Accuracy

60.00nF 10pF ±(3.5% + 10 digits)

600.0nF 0.1nF

6.000μF 1nF

60.00μF 10nF

600.0μF 100nF
6000μF 1μF ±(3.5% + 5 digits)

Maximum Input: 600V DC or 600V AC RMS

FREQUENCY (AUTO-RANGING)

9.999Hz 0.001Hz

99.99Hz 0.01Hz

999.9Hz 0.1Hz

9.999kHz 1Hz

99.99kHz 10Hz

500.0kHz 100Hz

Voltage Range: 2V to 220V RMS
Maximum Input: 600V DC or 600V AC RMS

DUTY CYCLE

1.0% to 99.9%

Pulse Width: 0.1 – 100ms
Frequency Width: 5Hz to 10kHz
Voltage Range: 2V to 220V RMS
Maximum Input: 600V DC or 600V AC RMS

0.1% ±(1.2% + 2 digits)

±(3.0% + 5 digits)

±(1.0% + 5 digits)

TEMPERATURE

-40° to 10°F 1°F ±(1.2% + 7°F)

11° to 1832°F 1°F ±(1.2% + 6°F)

-40° to -12°C 1°C ±(1.2% + 4°C)

-11° to 1000°C 1°C ±(1.2% + 3°C)

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ELECTRICAL SPECIFICATIONS

OTHER MEASUREMENT APPLICATIONS

Maximum Input: 1000V RMS in Voltage setting,

600V DC or 600V AC RMS in all other settings

• Diode Test: 1.5 mA max, open circuit voltage 3.2V DC

• Continuity Check: Audible signal when resistance <50Ω

• Low Impedence (Low Z): Input impedence >3kΩ

Max input 600V RMS

• Auto Power Off: After ~5 minutes of inactivity

• Sampling Frequency: 3 samples per second

• Overload: "OL" indicated on display, 1000V RMS in voltage

settings, 600V RMS in all other settings

• Polarity: "-" on display indicates negative polarity

• Display: 3-5/6 digit, 6000 Count Reverse Contrast Display,

TRMS technology

WARNINGS

To ensure safe operation and service of the meter, follow these
instructions. Failure to observe these warnings can result in
severe injury or death.

• Before each use verify meter operation by measuring a known
voltage or current.

• Never use the meter on a circuit with voltages that exceed the
category based rating of this meter.

• Do not use the meter during electrical storms or in wet weather.

• Do not use the meter or test leads if they appear to be damaged.

• Use only with CAT IV rated test leads.

• Ensure meter leads are fully seated, and keep fingers away
from the metal probe contacts when making measurements.

• Do not open the meter to replace batteries while the probes
are connected.

• Use caution when working with voltages above 25V AC RMS
or 60V DC. Such voltages pose a shock hazard.

• To avoid false readings that can lead to electrical shock,
replace batteries when a low battery indicator appears.

• Do not attempt to measure resistance or continuity on a live
circuit.

• Always adhere to local and national safety codes. Use personal
protective equipment to prevent shock and arc blast injury
where hazardous live conductors are exposed.

• Meter is IP42 dust & water resistant. Following any contact
with water, thoroughly dry meter and test lead jacks prior to
subsequent use.

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SYMBOLS ON METER

AC/DC Voltage or Current Resistance (in Ohms)
Audible Continuity Diode
Capacitance
Duty-cycle Double Insulated Class II

%

Temperature (Fahrenheit / Celsius) Ground

°F/°

C

Voltage (Volts)

V

Backlight mA Milliamps
Microamps Low Impedence

μA

Fuse (with rating below symbol)
Warning or Caution Read Instructions

To ensure safe operation and service of this meter, follow all warnings
and instructions detailed in this manual.

Risk of Electrical Shock

Improper use of this meter can lead to risk of electrical shock. Follow
all warnings and instructions detailed in this manual.

Frequency

Hz

Amperage (Amps)

A

SYMBOLS ON LCD

Data Hold Audible Continuity

H

Diode Auto Ranging
Alternating Current

AC

Low Battery Auto Power Off

MAX

Maximum Value

°F

Degrees Fahrenheit

M

Mega (value x 106)

m

mili (value x 10-3)

n

nano (value x 10-9)

A

Amps
Ohms

%

Duty-Cycle
Hazardous Voltage

Automatic

A

Backlight Adjustment

DC

MIN

°C

k
μ
V
F

Hz
REL
LoZ

M

Direct Current

Minimum Value
Degrees Celsius
kilo (value x 103)
micro (value x 10-6)
Volts
Farads
Hertz (Frequency)
Relative Mode
Low Impedence

Manual Backlight
Adjustment

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FEATURE DETAILS

1

7 9

8

10

11

12

2

3 5

46

NOTE: There are no user-serviceable parts inside meter.

6000 count Reverse Contrast Display7."RANGE" button

1.

Function selector switch

2.

"10A" jack

3.

"COM" jack

4.

"VΩ" jack

5.

"mA/µA" jack

6.

"REL" (Relative) button

8.

"MAX/MIN" button

9.

"HOLD"/Backlight button

10.

"SEL" (Select) button

11.

Optical Sensor

12.

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FUNCTION BUTTONS

ON/OFF

To Power ON the meter rotate the Function Selector switch 2 from
the OFF setting to any measurement setting. To Power OFF the meter
rotate the Function Selector switch 2 to the OFF setting. By default
the meter will automatically Power OFF after 5 minutes of inactivity.
Reactivate meter by pressing any button. To deactivate the automatic
Power OFF feature, power the meter ON with the SEL button
depressed. When automatic Power OFF is deactivated, the
symbol will not be visible in the display.

When the Function Selector switch is rotated to a measurement
setting, "LEAD" flashes on the display as a reminder to check that test
leads are inserted into the appropriate jacks.

"SEL" (SELECT) BUTTON (FOR SECONDARY FUNCTIONS)

The "SEL" button11activates the secondary functions for each
setting accessible by the Function Selector switch 2. For Current,
Voltage and Low Z, it toggles between AC and DC. For the other
functions, it switches between Continuity, Resistance, Diode-test,
and Capacitance. The default function for each application is printed
on the meter in white; the secondary functions are printed on the
meter in orange.

"HOLD" (DATA HOLD) / BACKLIGHT BUTTON

Press HOLD 10 to hold the measurement on the display. Press
again to release the display to return to live measuring.

Press and hold the "HOLD" button 10 for more than one second
second to manually adjust the backlight. Meter default is automatic
control of backlight based upon an optical sensor. The long presses
will scroll between high backlight, low backlight, and back to
automatic control. In automatic backlight mode, the "A" and
icons will be displayed. For manual backlight mode, the "M" and
icons will be displayed

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"RANGE" BUTTON

The meter defaults to auto-ranging measurement mode . This
automatically determines the most appropriate measurement range
for the testing that is being conducted. To manually force the meter
to measure in a different range, use the "RANGE" button 7.

1. Press the "RANGE" button 7 to manually select measurement
range ( is deactivated on the LCD). Repeatedly press
the "RANGE" button 7 to cycle through the available ranges,
stopping once the desired range is reached.

2. To return to auto-ranging mode, press and hold the "RANGE"
button 7 for more than one second ( is reactivated).

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FUNCTION BUTTONS

"REL" (RELATIVE) BUTTON

Relative measurements are available for Voltage, Current,
Resistance, Temperature, Capacitance and LoZ.

1. Perform first measurement.

2. With test leads connected, press REL 8 to set frame of reference.

3. Perform second measurement. The value displayed is the
difference between first and second measurements.

"MAX/MIN" BUTTON

When the "MAX/MIN" button
of the minimum and maximum value of the measurement as the
meter continues to take samples.

1. When measuring, press MAX/MIN
maximum value. If a new maximum occurs, the display updates
with that new value. Pressing again reveals the minimum value.
If a new minimum occurs, the display updates with the new
value.

2. Press MAX/MIN
to normal measuring mode.

and hold for more than one second to return

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is pressed, the meter keeps track

9

and the meter displays the

9

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5/32

(4 mm)

OPERATING INSTRUCTIONS

CONNECTING TEST LEADS

Do not test if leads are improperly seated. Results could cause
intermittent display readings. To ensure proper connection, firmly
press leads into the input jack completely.

INCORRECT

CORRECT

TESTING IN CAT III / CAT IV MEASUREMENT LOCATIONS

Ensure the test lead shield is pressed firmly in place. Failure to use
the CAT III / CAT IV shield increases arc-flash risk.

5/32"

(4 mm)

TESTING IN CAT II MEASUREMENT LOCATIONS

CAT III / CAT IV shields may be removed for CAT II locations. This
will allow testing on recessed conductors such as standard wall
outlets. Take care not to lose the shields.

0.7" (18 mm)

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OPERATING INSTRUCTIONS

AC/DC VOLTAGE (LESS THAN 1000V)

1. Insert RED test lead into VΩ jack

COM jack
setting.

, and rotate function selector switch 2 to the V

4

, and BLACK test lead into

5

NOTE: The meter defaults to AC measurement. To measure DC, press

the "SEL" button

to toggle between AC and DC modes. The AC or

11

DC icon on the LCD indicates which mode is selected.

Red leadBlack lead

2. Apply test leads to the circuit to be tested to measure voltage.

The meter will auto-range to display the measurement in the
most appropriate range.

NOTE: The hazardous voltage indicator will appear for voltages >30V.
NOTE: If "–" appears on the LCD, the test leads are being applied to

the circuit in reverse. Swap the position of the leads to correct this.
NOTE: When in a voltage setting and the test leads are open,

readings of order mV may appear on the display. This is noise and
is normal. By touching the test leads together to close the circuit
the meter will measure zero volts.

AC/DC LO Z VOLTAGE (LESS THAN 600V)

Voltage measurements in Low Impedance (Lo Z) setting can be used
to identify ghost or stray voltages.

• Follow same procedure for measuring AC/DC Voltage (see above)

with Function Selector switch

in the Lo Z setting.

2

Red leadBlack lead

DO NOT attempt to measure voltages greater than 600V in

Lo Z setting.

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OPERATING INSTRUCTIONS

AC/DC CURRENT

NOTE: The meter defaults to AC measurement. To measure DC, press

the "SEL" button

DC

icon on the LCD indicates which mode is selected.

to toggle between AC and DC modes. The AC or

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1. Attach test leads to the appropriate jacks and rotate function
selector switch

2

to the appropriate setting as follows:

• For AC/DC currents >600mA and <10A: Insert RED test lead into
10A jack
function selector switch

3

, and BLACK test lead into COM jack 4, and rotate

Red lead Black lead

2

to the 10A AC/DC setting.

• For mA AC/DC currents <600mA: Insert RED test lead into
mA/µA jack
rotate function selector switch

, and BLACK test lead into COM jack 4, and

6

2

to the mA AC/DC setting.

Black leadRed lead

• For µA DC currents <600µA: Insert RED test lead into
μA/mA jack
rotate function selector switch

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, and BLACK test lead into COM jack 4, and

6

Black leadRed lead

2

to the µA AC/DC setting.

1.

OPERATING INSTRUCTIONS

2. To measure current: Remove power from circuit, open circuit at
measurement point, connect meter in-series in the circuit using
the test leads, and apply power to circuit.The meter will auto­range to display the measurement in the most appropriate range.

Do not attempt to measure more than 10A.

When measuring currents greater than 6A, a measurement
time of 30 seconds followed by 10 minutes of recovery time
is recommended.

CONTINUITY

1. Insert RED test lead into VΩ jack

,

into COM jack

and rotate function selector switch 2 to the

4

Continuity/Resistance/Diode/Capacitance

, and BLACK test lead

5

setting.

NOTE: The meter defaults to Continuity testing in this mode. Ensure
that the Continuity Testing icon
press the "SEL" button

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is visible on the display. If not,

until the icon appears.

2. Remove power from circuit.

3. Test for continuity by connecting conductor or circuit with test

leads. If resistance is measured less than 50Ω, an audible signal
will sound and display will show a resistance value indicating
continuity. If circuit is open, display will show "OL".

Red leadBlack lead

DO NOT attempt to measure continuity on a live circuit.

RESISTANCE MEASUREMENTS

1. Insert RED test lead into VΩ jack

into COM jack

,

and rotate function selector switch 2 to the

4

Continuity/Resistance/Diode/Capacitance

, and BLACK test lead

5

setting.

NOTE: The meter defaults to Continuity testing in this mode. To
enter Resistance testing mode, press the "SEL" button

once.

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2. Remove power from circuit.

3. Measure resistance by connecting test leads to circuit. The

meter will auto-range to display the measurement in the most
appropriate range.

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OPERATING INSTRUCTIONS

Red leadBlack lead

NOTE: When in a Resistance setting and the test leads are open
(not connected across a resistor), or when a failed resistor is under
test, the display will indicate O.L. This is normal.

DO NOT attempt to measure resistance on a live circuit.

DIODE TEST

1. Insert RED test lead into VΩ jack

into COM jack
Continuity/Resistance/Diode/Capacitance

,

and rotate function selector switch 2 to the

4

, and BLACK test lead

5

setting.

NOTE: The meter defaults to Continuity testing in this mode. To
enter Diode testing mode, press the "SEL" button
Diode icon

2. Touch test leads to diode. A reading of 200-700mV on display

indicates forward bias, "OL" indicates reverse bias. An open
device will show "OL" in both polarities. A shorted device will
show approximately 0mV.

will appear on the display.

twice. The

11

Red leadBlack lead

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OPERATING INSTRUCTIONS

CAPACITANCE

1. Insert RED test lead into VΩ jack

COM jack

4

, and rotate function selector switch 2 to the

Continuity/Resistance/Diode/Capacitance

, and BLACK test lead into

5

setting.

NOTE: The meter defaults to Continuity testing in this mode. To
enter Capacitance testing mode, press the "SEL" button

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three

times. "nF" or "µF" will appear on the display.

2. Remove power from circuit.

3. Measure capacitance by connecting test leads across the

capacitor. The meter will auto-range to display the measurement
in the most appropriate range.

Red leadBlack lead

FREQUENCY / DUTY-CYCLE

1. Insert RED test lead into VΩ jack

COM jack

4

, and rotate function selector switch 2 to the

Frequency/Duty-Cycle

and BLACK test lead into

5

setting.

NOTE: The meter defaults to Frequency testing in this mode. To enter
Duty-Cycle testing mode, press the "SEL" button
that the appropriate icon (either

Hz

or %) appears on the display.

once. Ensure

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2. Measure by connecting test leads across the circuit.

Red leadBlack lead

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OPERATING INSTRUCTIONS

TEMPERATURE

1. Insert K-type thermocouple with adapter into the VΩ

jacks (observe polarity markings on thermocouple and meter), and
rotate function selector switch 2 to the Temperature setting.

and COM

5

4

NOTE: The meter defaults to Fahrenheit scale in this mode. To enter

Celsius scale, press the "SEL" button 11 once. Ensure that the
appropriate icon (either °F or °C) appears on the display.

2. To measure temperature, make contact between the

thermocouple tip and the object being measured. When
thermocouple tip and object are in thermal equilibrium, the
measurement on the display will stabilize. The meter will auto-

range to display the measurement in the most appropriate range.

K-Type

Thermocouple

Remove thermocouple before switching meter to other
measurement functions.

The thermocouple included with the original purchase
is suitable for temperatures below 356°F / 180°C only. To
measure higher temperatures, a K-type thermocouple
with the appropriate measurement range should be used.

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MAINTENANCE

BATTERY REPLACEMENT

When the

1. Remove screw from battery/fuse door.

2. Replace 2 x AAA batteries (note proper polarity).

3. Replace battery/fuse door and fasten securely with screw.

FUSE REPLACEMENT

A fuse may blow if more than 800mA is applied to the
or more than 10A is applied to the 10A jack

1. Remove screw from battery/fuse door.

2. Replace blown fuse(s) with:

μA/mA jack

3. Replace battery/fuse door and fasten securely with screw.

indicator is displayed, the batteries must be replaced.

μA/mA

. To access fuses:

3

:

800mA/1000V fast-blow (Klein Cat. No. 69399)

10A jack3: 10A/1000V fast-blow (Klein Cat. No. 69034)

6

jack 6,

2× AAA batteries

800mA/1000V fast-blow fuse

(Klein Cat. No. 69399)

10A/1000V fast-blow fuse

(Klein Cat. No. 69034)

T

o avoid risk of electric shock, disconnect leads from any voltage

source before removing battery/fuse door.

To avoid risk of electric shock, do not operate meter while
battery/fuse door is removed.

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CLEANING

Be sure meter is turned off and wipe with a clean, dry lint-free
cloth.

Do not use abrasive cleaners or solvents.

STORAGE

Remove the batteries when meter is not in use for a prolonged
period of time. Do not expose to high temperatures or
humidity. After a period of storage in extreme conditions
exceeding the limits mentioned in the General Specifications
section, allow the meter to return to normal operating
conditions before using.

FCC & IC COMPLIANCE

for FCC compliance information.

Canada ICES-003 (B) / NMB-003 (B)

WARRANTY

DISPOSAL / RECYCLE

Do not place equipment and its accessories in the trash.
Items must be properly disposed of in accordance with local
regulations. Please see www.epa.gov/recycle for additional
information.

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