AC/DC CLAMP METER CM4374 (Bluetooth®)

True RMS 2000 A AC/DC Clamp Meter with Bluetooth Wireless Technology for Advanced Applications and the Toughest Situations

Hioki clamp on meters are best-in-class measuring devices incorporating Hioki’s expertise in current sensing technology. The CM4374 is a 2000A True RMS clamp meter that features stronger jaws, broader -25°C to 65°C operating temperature range and IP54 dustproof and waterproof enclosure to enable professionals to work quickly in tough situations including the development, repair, and maintenance of equipment and devices such as electric vehicles. Additionally, the high-voltage DC measurement capability of up to 1700 V (*1) is ideal for the clamp maintenance inspections of electrical and solar power equipment. Measured values can be sent to a smartphone or tablet using Bluetooth® wireless technology and displayed as waveforms in real time.

CAT IV 600 V, CAT III 1000 V

CM4370 Series Clamp Meters Product Video

Key Features

  • Send measured values to a smartphone or tablet using Bluetooth® wireless technology
  • Multiple measurement functions
  • IP54 dustproof and waterproof enclosure
    Jaws (current sensor portion): IP50
  • Measure DC voltages of up to 1700 V (*1) for open voltage inspections of solar panels
  • Simultaneously measure inrush current in RMS and crest values
  • Expanded -25°C to 65°C operating temperature range
  • Automatic AC/DC function helps boost work efficiency
  • *1:Your instrument can be used to measure voltages in excess of 1000V DC if and only if both of the following conditions are satisfied:
  • 1. The circuit under measurement is isolated from the commercial power grid.
  • 2. The circuit under measurement is isolated from ground.
  • e.g.: When measuring the no-load voltage of an ungrounded PV panel
  • Do not use the instrument with circuits whose terminal-to-ground voltage exceeds 1000V. Doing so may result in electric shock.

Model No. (Order Code)

CM4374 Built in Bluetooth(R) wireless technology
*For the latest information about countries and regions where wireless operation is currently supported, please visit the Hioki website. *The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by HIOKI E.E. CORPORATION is under license. *Android, Google Play and the Google Play logo are trademarks of Google Inc. *iOS is a registered trademark of Cisco Technology, Inc. and/or its affiliates in the United States and certain other countries. *iPhone, iPad, iPad mini, iPad Pro and iPod touch are trademarks of Apple Inc. *Apple and the Apple logo are trademarks of Apple Inc. App Store is a service mark of Apple Inc.

Data can be downloaded to tablets and smartphones using Hioki’s dedicated free app "GENNECT Cross," available from the Google Play or App Store.

Germany iF Design Award CM4371 series

Instantly create reports by a free app (GENNECT Cross)

GENNECT Cross, a free app designed specifically for use with Hioki measuring instruments, lets you check and manage measurement results and create reports.
The software provides a range of functionality that helps manage data in the field, including photographing measurement sites, placing measurement results on photographs, and saving hand written memos.

Click here for details about GENNECT Cross

Using the Wireless Feature to Display Data on a Mobile Device: How to Use Hioki Clamp Meters

Measured values captured by the Hioki CM4372 and CM4374 AC/DC Clamp Meters can be displayed and saved onto a mobile device wirelessly. The results can also be used to create automatic reports. Simply install the free GENNECT Cross app onto your mobile device and connect to the Hioki clamp meters. Reports created on your mobile device can even be e-mailed to the office to further increase work efficiency.

Current Measurement Function: How to Use the Hioki CM4370 Series Clamp Meters

Learn how to effectively use the current measurement function with this short video.

Auto Hold Function: How to Use the Hioki CM4370 Series Clamp Meters

The Auto Hold feature is perfect in situations where the display is hard to read because the clamped wires are in hard to reach locations. With Auto Hold, measured results automatically freeze on the display until the next measurement starts, making testing and record taking a snap.

Max/Min/AVG/Peak Function: How to Use the Hioki CM4370 Series Clamp Meters

Watch this video to learn how to capture the maximum, minimum, average and peak values of a current signal, available when the AUTO AC/DC mode is not in use.

Simultaneous Display of DC Current and DC Voltage: How to Use the Hioki CM4370 Series Clamp Meters

The CM4370 Series can measure both DC current and DC voltage with a single device at the same time, making it ideal for automotive battery testing and inspection and maintenance of solar panels.

Inrush Measurement Function: How to Use the Hioki CM4370 Series Clamp Meters

Accurately measure the startup or inrush current of motors and equipment. The CM4370 series is engineered to detect the full startup current period and then identify the RMS waveform as well as the highest waveform peak.

Voltage Measurement Function: How to Use the Hioki CM4370 Series Clamp Meters

The DMM function of the AC/DC clamp meter is advanced enough to measure up to 1700V AC/DC. Watch this video to learn more.

Continuity Check Function: How to Use the Hioki CM4370 Series Clamp Meters

The DMM function of the AC/DC clamp meter also provides a continuity check function. Easily detect short-circuits with the clear buzzer and red LED.

AC Voltage Detection Function: How to Use the Hioki CM4370 Series Clamp Meters

The tip of the current sensor of the CM4370 Series can also detect live voltages, eliminating the need for you to use a separate voltage detector. Energized lines are identified with a loud buzzer and red LED on the clamp meter.

Basic specifications

Accuracy guaranteed: 1 year, Accuracy guarantee period after adjustment made by Hioki: 1 year
DC Current range 600.0 A/2000 A, Basic accuracy: ±1.3% rdg. ±0.3 A (600A range)
AC Current range 600.0 A/2000 A (10 Hz to 1 kHz, True RMS), Basic accuracy: ±1.3% rdg. ±0.3 A (600A)
Crest factor 600.0 A range: 3 or less, 2000 A range: 2.84 or less
DC+AC Current range 600.0 A/2000 A (10 Hz to 1 kHz, True RMS), Basic accuracy DC, 45-66 Hz: ±1.3% rdg. ±1.3 A (at 600 A)
DC Voltage range 600.0 mV to 1700 V (*1), 5 ranges, Basic accuracy: ±0.5% rdg. ±0.5 mV (at 600 mV)
AC Voltage range 6.000 V to 1000 V, 4 ranges (15 Hz to 1 kHz, True RMS), Basic accuracy 45 - 66 Hz: ±0.9% rdg. ±0.013 V (at 6 V)
DC+AC Voltage range 6.000 V to 1000 V, 4 ranges, Basic accuracy DC, 45 - 66 Hz: ±1.0% rdg. ±0.023 V (at 6 V)
Resistance range 600.0 Ω to 600.0 kΩ, 4 ranges, Basic accuracy: ±0.7% rdg. ±0.5 Ω (at 600 Ω)
Capacitance range 1.000 μF to 1000 μF, 4 ranges, Basic accuracy: ±1.9% rdg. ±0.005 μF (at 1 μF)
Frequency range 9.999 Hz to 999.9 Hz, 3 ranges, Basic accuracy: ±0.1% rdg. ±0.003 Hz (at 9.999 Hz)
Temperature (K) -40.0 to 400.0 ˚C, add temperature probe accuracy to basic accuracy of ±0.5% rdg. ±3.0 ˚C
Voltage detection Hi: 40 V to 600 V AC, Lo: 80 V to 600 V AC, 50/60 Hz
Other functions Automatic AC/DC detection, Plus/Minus judgement function of DC A, DC V, Max/Min/Average/PEAK MAX/ PEAK MIN value display, Filter function, Display value hold, Auto hold, Back light, Auto-power save, Buzzer sounds, Zero-adjustment
Dustproof, waterproof Grip: IP54 (when measuring an insulated conductor only), Jaw (the current sensor portion of the instrument)/ barrier: IP50 *Risk of electric shock from the conductor being measured increases when wet.
Interface Bluetooth® 4.0LE, Supported devices: iOS, Android™ smartphone/tablet
GENNECT Cross (free downloadable app) : display measured values and waveforms, Simple logging function, Waveform monitor function, Hold save function
Power supply LR03 Alkaline battery ×2, Continuous use: 45 hr (Backlight OFF, Bluetooth® OFF), 24 hr (Backlight OFF, Bluetooth® ON)
Core jaw diameter φ55 mm (2.17 in), Jaw dimension: 92 mm (3.62 in) W×18 mm (0.71 in) D
Dimensions and mass 65 mm (2.56 in) W×250 mm (9.84 in) H×35 mm (1.38 in) D mm, 530 g (18.7 oz)
Accessories TEST LEAD L9207-10, CARRYING CASE C0203, LR03 Alkaline battery ×2, Instruction Manual ×1, Precautions Concerning Use of Equipment that Emits Radio Waves ×1
  • *1:Your instrument can be used to measure voltages in excess of 1000V DC if and only if both of the following conditions are satisfied:
  • 1. The circuit under measurement is isolated from the commercial power grid.
  • 2. The circuit under measurement is isolated from ground.
  • e.g.: When measuring the no-load voltage of an ungrounded PV panel
  • Do not use the instrument with circuits whose terminal-to-ground voltage exceeds 1000V. Doing so may result in electric shock.

Countries and regions where wireless operation is currently supported (CM4374)

Last update: October 2021
Countries and regions where wireless operation is currently supported Australia, Austria, Bangladesh, Belgium, Bulgaria, Canada, Chile, Colombia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Georgia, Germany, Greece, Hong Kong, Hungary, Iceland, Ireland, Italy, Japan, Kenya, Latvia, Liechtenstein, Lithuania, Luxembourg, Macao, Malta, Myanmar, Netherlands, New Zealand, Norway, Peru, Philippines, Poland, Portugal, Romania, Saudi Arabia, Singapore, Slovakia, Slovenia, Spain, Sweden, Switzerland, Thailand, Turkey, United Kingdom, United States, Viet Nam
Note Use of devices that emit radio radiation requires approval in the country of use. Thus, use of the instrument in a country or region where they have not been approved may be subject to penalty as a violation of law.

Test leads (2)

L9207-10 is a bundled accessory

Options for Test leads (for the L9207-10) (2)

Options for Test leads (for the L4930) (10)

Test Pin Set L4932 is required when using the Small Alligator Clip Set L4934

Temperature measurement (1)

Other options (1)

Bundled accessory


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