HIOKI CM4373-90 - AC/DC True RMS Clamp Multimeter with 2000 A Current Range

True RMS clamp multimeter with 2000 A AC/DC current range, voltages up to 1000 V AC/DC. CAT IV 600 V / CAT III 1000 V, 55 mm maximum conductor diameter; resistance, capacitance, continuity, diode test, inrush, Bluetooth included (Z3210)

Product information HIOKI CM4373-90 - AC/DC True RMS Clamp Multimeter with 2000 A Current Range


Key Specifications

  • Current measurement up to 2000 A AC/DC
  • Voltage measurement up to 1000 V AC/DC (2000 V DC with optional P2010)
  • 55 mm core jaw diameter
  • Safety rated CAT IV 600 V / CAT III 1000 V and CAT III 2000 V with P2010
  • Integrated Bluetooth communication with included Z3210 adapter

Typical Applications

  • High-current measurement in industrial power distribution, switchgear, and largescale equipment
  • Maintenance and troubleshooting of solar power systems and high-voltage EV chargers
  • Inrush current testing for large motors, transformers, and heavy machinery
  • On-site diagnostics and field service where large conductor sizes require 55 mm jaws

Detailed Product Overview

The CM4373-90 Clamp Multimeter is the right choice for professionals who need safe and precise measurement of very large AC/DC currents. With a wide 2000 A range and True RMS accuracy, it is ideal for industrial power distribution, heavy machinery, and EV charging systems. Its 55 mm jaws accommodate large-diameter insulated conductors, ensuring accurate measurement in applications where smaller clamp meters may not fit. The CM4373- 90 comes as a set consisting of the CM4373-50 Clamp Multimeter and the Z3210 Bluetooth adapter, providing wireless capability right out of the box.

Voltage measurement up to 1000 V AC/DC covers most requirements. When paired with the optional P2010 High Voltage Divider, the measurement range extends up to 2000 V DC in CAT III environments, making the instrument suitable for safe testing of photovoltaic strings and high-voltage batteries. True RMS technology guarantees reliable results even with distorted waveforms.

Versatile multimeter functions

Beyond its high-current capability, the CM4373-90 also offers a full set of multimeter functions: resistance, capacitance, continuity, diode polarity check, and inrush current measurement. Automatic AC/DC detection and advanced display options (Max/Min/Avg, PEAK values, filter function, manual/auto hold, pass/fail judgement) make everyday tasks faster and more efficient. The included L9300 test leads feature a slide-type mechanism that allows the metal tips to be extended or retracted, eliminating removable caps and simplifying handling.

Bluetooth and safety ratings

With the included Z3210 Bluetooth adapter, measurement data can be transferred directly to the GENNECT Cross app on iOS or Android smart devices for easy wireless logging and reporting. The app also enables harmonic analysis from 1st to 30th order for extended diagnostic capability.

The CM4373-90 complies with CAT IV 600 V / CAT III 1000 V, and with the P2010 it also supports CAT III 2000 V. Its rugged housing is rated IP54 for dust and splash resistance, ensuring safe operation on construction sites and in harsh outdoor conditions. Like all HIOKI instruments, the CM4373-90 is designed and manufactured at HIOKI’s own factories in Japan, ensuring accurate performance, safety, and long-term reliability
  • CM4373-50 Clamp Multimeter
  • Z3210 Bluetooth Adapter 
  • L9300 Test leads 
  • C0203 Carrying Case
  • 2 × AAA (LR03) batteries
  • Instruction manual 
  • Safety instructions

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