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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℃ to 65℃ 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 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.


1000 V Data can be downloaded to tablets and smartphones using Hioki’s dedicated apps available from the Google Play or Apple Store.  Search for “HIOKI” and download the “GENNECT Cross” app.

Key Features

  • Send measured values to a smartphone or tablet using Bluetooth® wireless technology
  • Multiple measurement functions
  • Automatic AC/DC function helps boost work efficiency
  • Measure DC voltages of up to 1700 V
  • Simultaneously measure inrush current in RMS and crest values
  • Expanded -25 °C to 65 °C operating temperature range
  • IP54 dustproof and waterproof enclosure *Jaws (current sensor portion): IP50

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

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.

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

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.

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

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.

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

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.

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

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.

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

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.

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