HIOKI Clamp Meters – Made in Japan since 1971
Field-proven in installation, maintenance, and troubleshooting
- AC clamp meters – for standard installation measurements
- AC/DC clamp meters & clamp multimeters – for DC, voltage, and multi-parameter testing
- AC leakage clamp meters – for detecting leakage, differential, and load currents
- AC clamp power meters – for analyzing electrical power, power factor, and phase conditions
Whether checking load currents, locating leakage, or evaluating power – HIOKI has been manufacturing clamp meters exclusively in its own factories in Japan since 1971.
HIOKI 3280-10F - AC Clamp Meter with 3 Current Ranges up to 1000 A
HIOKI CM3289 - True RMS Clamp Meter for AC Currents up to 1000 A
HIOKI 3288-20 - AC/DC True RMS Clamp Meter with 1000 A Current Range
HIOKI CM4373-50 - AC/DC True RMS Clamp Multimeter with 2000 A Current Range
HIOKI CM4371-50 - AC/DC True RMS Clamp Multimeter with 20 A and 600 A Current Ranges
HIOKI CM4375-50 - AC/DC Clamp Multimeter for confined spaces, 1000 A
HIOKI CM4002 - AC Leakage Clamp Meter for µA Leakage, 200 A
HIOKI CM4001 - AC Leakage Clamp Meter for Leakage and Load Current, 600 A
HIOKI 3287 - AC/DC True RMS Clamp Meter with 10 A and 100 A Current Ranges
HIOKI CM3286-50 - Clamp Power Meter, 600 A, 360 kW
HIOKI CM4375-93 - Clamp Multimeter PV Kit, 1000 A AC/DC, 2000 V DC and Bluetooth
HIOKI CM4003 - AC Leakage Clamp Meter for Leakage Monitoring, 200 A
AC Clamp Meters for Electrical Installations and Power Distribution
AC clamp meters are ideal for measuring AC currents in electrical installations, distribution panels, and industrial AC applications. All HIOKI AC clamp meters also support AC and DC voltage measurements, resistance, and continuity testing.
Compact models like the 3280-10F are suited for routine checks, while True RMS models such as the CM3291 ensure reliable readings in circuits with non-sinusoidal currents. For higher safety requirements and extended functions, the CM4141-50 is a versatile option.
Selected models can be combined with the CT6280 Flexible Current Sensor to measure up to 4200 A on large conductors, busbars, and cable bundles. Check out the whole portfolio.
| Feature | CM4141-50 CM4141-90 |
CM3291 | CM3281 | CM3289 | 3280-10F 3280-70F |
|---|---|---|---|---|---|
| AC Current | 2000 A | 1000 A | |||
| True RMS | yes | yes | - | yes | - |
| Conductor diameter | 55 mm | 46 mm | 33 mm | ||
| Voltage (AC / DC) |
1000 V | 600 V | |||
| Safety Rating | CAT IV 600 V CAT III 1000 V |
CAT IV 300 V CAT III 600 V |
CAT IV 300 V / CAT III 600 V (current) CAT III 300 V (voltage) |
||
| Bluetooth | available or included | - | |||
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AC/DC Clamp Multimeters for DC, High Voltage, and More
AC/DC clamp multimeters are ideal for measurement tasks beyond standard current checks. They are well suited for testing switching power supplies, inverters, PV installations, and EV charging equipment, where DC measurement, extended functions, and high safety ratings are required.
For smaller currents, models like the 3287 and CM4371-50 offer high resolution and True RMS for reliable readings even with distorted waveforms. The CM4375-50 offers a slim clamp design ideal for confined spaces, while the Clamp Multimeter CM4373-50 handles larger conductors and higher currents.
Selected models support wireless data transfer via the optional Z3210 Bluetooth Adapter and safe DC measurements up to CAT III 2000 V with the P2010 High Voltage Divider.
| Feature | CM4371-50 CM4371-90 |
CM4373-50 CM4373-90 CM4373-93 |
CM4375-50 CM4375-90 CM4375-93 |
3287 | 3288-20 | 3288 |
|---|---|---|---|---|---|---|
| Current (AC / DC) |
20 A / 600 A |
600 A / 2000 A |
1000 A | 10 A / 100 A |
100 A / 1000 A |
100 A / 1000 A |
| True RMS | Yes | - | ||||
| Voltage (AC / DC) |
1000 V | 600 V | ||||
| AC+DC voltage and current |
yes | - | ||||
| Safety Rating |
CAT IV 600 V CAT III 1000 V |
CAT III 300 V (voltage) CAT III 600 V (current) |
||||
| Bluetooth | available or included | - | ||||
AC Leakage Clamp Meters for µA Leakage and Long-Term Monitoring
AC Leakage clamp meters are used when RCD trips occur, leakage paths need to be identified, or very small leakage currents can no longer be captured reliably with conventional clamp meters.
HIOKI AC leakage clamp meters measure leakage and differential current but also load current. With True RMS and a 50/60 Hz filter, they isolate leakage currents relevant to RCD or GFCI behavior from higher-frequency components caused by inverters or switching power supplies.
The compact CM4001 Leakage Clamp Meter is suitable for confined panels, the CM4002 focuses on highly sensitive µA leakage diagnosis, and the CM4003 on long-term monitoring with RMS and waveform output. All models can be expanded with the Z3210 Bluetooth Adapter, while the -90 sets already include it.
| Feature | CM4001 CM4001-90 |
CM4002 CM4002-90 |
CM4003 CM4003-90 |
|---|---|---|---|
| Designed for | Confined panels, leak and load currents |
µA leakage diagnosis, RCD/GFCI faults |
Long term monitoring, intermittent faults |
| Lowest measurable current | 600 µA | 60 µA | |
| AC Current ranges |
5 ranges: 60 mA to 600 A |
6 ranges: 6 mA to 200 A |
|
| Max. conductor diameter | 24 mm | 40 mm | |
| Measurement output | - | RMS and waveform | |
| Safety Rating | CAT III 300 V |
CAT IV 300 V CAT III 600 V |
CAT III 300 V |
AC Clamp Power Meters for Power Measurement and Energy Consumption
Unlike DC systems where current and voltage is multiplied, AC power measurement additionally requires accurate phase detection between current and voltage which is included in the calculation.
The CM3286-50 Clamp Power Meter combines clamp current measurement with voltage measurement via test leads to determine active, reactive, and apparent power, as well as power factor and phase angle. It is ideal for load and energy consumption analysis in single-phase circuits and for evaluating balanced and unbalanced three-phase systems.
HIOKI’s expertise in high-precision power analysis reflects the company’s depth of expertise in power measurement. With the optional Z3210 Bluetooth Adapter, measured values can be transferred wirelessly and harmonics analyzed in the app; the adapter is already included in the -90 sets.
HIOKI: Current Measurement Since 1971
What defines the accuracy of a clamp meter? Discover how HIOKI has advanced current sensing since 1971 — minimizing phase shift, noise, and temperature drift to deliver reliable, non-intrusive measurements.
Dive deeper into the technology in our blog.