Clamp Meters

Clamp meters are portable test instruments that measure AC and/or DC current without breaking the circuit – using magnetic field sensing via the jaw. Working on the principle of a current transformer, they are indispensable for live panel maintenance, industrial motor monitoring, and power analysis where instantaneous current readings are needed while the system remains energized. Our category includes digital and analog models, as well as clamp‑only current adaptors; many units also support voltage, resistance, frequency, and temperature measurements, effectively functioning as a full‑featured multimeter.

Key Factors When Choosing a Clamp Meter

• Current Type: AC, DC, or AC+DC True RMS capability; True RMS is critical in harmonic‑rich environments such as VFD outputs.
• Jaw Opening: Adequate clamp diameter (e.g., 30 mm, 40 mm, 52 mm) must match the conductor size in the application.
• Measurement Range and Resolution: Models ranging from mA levels up to hundreds of amperes should meet project requirements.
• Additional Features: Voltage, capacitance, NCV (non‑contact voltage detection), data hold, min/max recording, Bluetooth/USB connectivity, and appropriate CAT safety class.
• Safety: Compliance with IEC 61010, particularly CAT III and CAT IV ratings, is essential for industrial environments.

Depending on the use case, compact mini clamp meters deliver advantages in tight spaces, while logging‑enabled instruments are ideal for long‑term trend analysis. Special adaptor clamps designed for lightning current, earth resistance, or leakage current measurements offer high sensitivity at low current levels. Choose the right model by evaluating both accuracy requirements and the environmental conditions (dust, humidity, temperature) of the working site.