True RMS (Root Mean Square) measurement accurately calculates the effective current in non-sinusoidal waveforms. Unlike average-reading meters, True RMS clamp meters provide precise readings when measuring variable frequency drives, LED lighting, and other non-linear loads commonly found in modern electrical systems.

CAT III rating indicates the meter is suitable for use in industrial and commercial installations. Our CAT III 600V clamp meters are approved for testing at distribution boards and main circuits, making them suitable for electricians and technicians working in industrial environments. This rating ensures safety compliance and measurement reliability.

Most of our models feature AC measurement as standard, with specific models like the HK221A/HK221C+ offering AC/DC hybrid capability. The True RMS technology specifically measures AC current accurately in complex waveforms. For DC current measurement, dedicated DC-capable models are recommended. Check individual product specifications for exact AC/DC capabilities.

Jaw size (measured in millimeters) determines the maximum conductor diameter that can fit in the clamp. Our models range from Ø15mm to Ø19mm. A smaller jaw size (like Ø15mm) is better for tight spaces and dense cable bundles, while larger jaws (Ø19mm) accommodate standard conduit and larger cables. Choose based on your typical field conditions.

Our current clamp meters offer comprehensive multi-function testing capabilities including: AC/DC voltage measurement, resistance testing, capacitance measurement, frequency detection, duty cycle analysis, and continuity testing. This makes them versatile troubleshooting tools for complete electrical diagnostics in a single portable device.