This instrument is a clamp meter that can perform true RMS measurement of current simply by clamping it around a circuit. In addition to current, it provides voltage measurement, frequency measurement, rush current measurement, resistance measurement, diode measurement, capacitance measurement, temperature measurement, voltage detection, and DC power measurement. The CM4372 and CM4374 also provide Bluetooth communications functionality, allowing measurement data to be monitored and logged from a smartphone or tablet.

Damage-resistant jaws Guaranteed for 30,000 open-close cycles

A revised design features stronger jaws (the current sensor portion of the instrument) and a dramatic boost in the duration of the warranty from 10,000 to 30,000 open-close cycles to ensure the instrument will provide even more years of reliable use.

Clamp open/ close test

In this test, the jaws are opened and closed a specified number of times at the rate of one cycle per second. In addition, the test is continued until the jaws break to provide a better understanding of their strength. Tests like this help us improve the instrument’s durability.

-25°C to + 65°C Expanded operating temperature range

Thanks to an operating temperature range that has been expanded from the previous design (which could be used from 0°C to 40°C), the CM4370 Series can be used in freezing temperatures or on the hottest summer days.

Temperature test

In this test, we verified that the clamp meter can operate for an extended period of time while taking normal measurement in the specified temperature range.

Dustproof and waterproof performance Enhanced environmental resistance

International Protection Code: IP54*

*Jaws (current sensor portion): IP50 Measurement functionality is maintained despite exposure to sand or dust as well as water droplets. Enhanced environmental resistance

Caution: The CM4370 Series’ waterproof enclosure is designed to enable the instrument to maintain its measurement functionality even when wet. Getting the instrument wet or measuring energized parts with wet hands increases risk of electric shock.

Dustproof and waterproof tests

In the dustproof test, the clamp meter’s enclosure is placed under reduced pressure and exposed to dust, and in the waterproof test, the instrument is sprayed with water from multiple directions in order to investigate how readily dust and water can get in.

CAT IV 600 V Expanded range of measurement targets

The CM4370 Series can safely measure service wires with a wire-to-ground volt- age of up to 600 V as well as wires found in distribution panels. The clamp meter series features a safe design that can withstand a transient overvoltage of 8 kV in case of a lightning strike.

DC 1700 V Measure high DC voltages

The CM4370 Series can measure DC volt- ages of up to 1700 V, making them ideal for no-load voltage inspections of rapidly evolving solar power systems.

Safety test

Temperature of the various parts of the clamp meter was measured while 1700 V DC was applied in order to ensure that there is no risk of burns or other injury.

Giving shape to ease of use and intuitive operation

Clamp-on meter with Bluetooth

Making measurement more intelligent

The instruments listed below will be able to send measured values to a smartphone or tablet using Bluetooth ® wireless technology, enabling you to display measured values and waveforms in real time.