Martindale CM57 AC TRMS Clamp Meter
The Martindale CM57 AC TRMS Clamp Meter is a small instrument designed for electrical testing and HVAC work. It measures AC current without breaking the circuit and provides resolution down to 10 mA. Its True RMS measurement supports reliable readings when checking AC systems.
Alongside AC current, the meter measures AC and DC voltage, resistance, capacitance and frequency. A built-in non-contact voltage sensor provides a quick way to detect live voltage through the clamp jaw. The display light and hold function also help when working in dark or tight locations.
Its compact build makes the Martindale CM57 AC TRMS Clamp Meter easier to position where access is limited. Its oval jaw fits around cables up to 25 mm in width or 35 × 15 mm, while the control wheel supports one-handed use. Auto-ranging, automatic power-off and a low-battery warning make regular testing easier and help users manage the instrument during daily work.
Key Benefits
- Measures AC current without breaking the circuit.
- True RMS operation supports dependable AC measurements.
- Auto-ranging reduces the need for manual range selection.
- A thumbwheel allows convenient single-handed operation.
- The compact elliptical jaw reaches restricted locations.
- A backlit display improves visibility in low-light areas.
- The hold function keeps a useful reading on the display.
- Non-contact detection helps identify the presence of live voltage.
- Automatic power-off helps preserve battery life between tests.
- Capacitance and frequency modes support wider fault-finding tasks.
Common Applications
Martindale CM57 AC TRMS Clamp Meter is suitable for a range of testing, maintenance and inspection tasks, including:
- Measuring AC current in HVAC equipment.
- Checking AC and DC voltage levels.
- Testing resistance and circuit continuity.
- Measuring component capacitance.
- Checking current and voltage frequency.
- Detecting the presence of live voltage without contact.
- Electrical fault finding in areas with restricted access.
- Routine testing by electricians and service teams.
Why Choose This Model?
The CM57 adds True RMS measurement, frequency, capacitance, non-contact voltage detection and a display backlight compared with the CM55. It also accepts a larger conductor than the CM69, while retaining a CAT III 600 V safety category.
