Martindale CM57 AC TRMS Clamp Meter

Product no.: CM57
Old price £99.00
from £56.93
Price plus VAT, plus delivery

Martindale CM57 AC TRMS Clamp Meter

  • True RMS measurement
  • Autoranging 60.00A & 600.0A AC
  • AC/DC voltage to 600V
  • Resistance to 6MΩ
  • Smart sense capacitance to 600µF
  • Frequency measurement
  • Continuity & diode test
  • Non-contact voltage sensor
  • Display backlight


The CM57 is a new pocket sized high performance AC Clamp meter measuring AC current, AC/DC voltage, resistance with continuity test plus capacitance, frequency and diode test. The compact rugged design enables accurate and reliable current measurement down to 10mA resolution without the need to break into the circuit.

True RMS measurement ensures reliable readings with distorted waveforms often caused by modern lighting and power supplies.

Features include a thumbwheel for single handed operation, auto ranging for ease of use, auto power off and low battery indicator plus a high contrast backlit display with hold function useful for working in low light and hard to reach areas. The Smart function automatically detects and switches between resistance and capacitance measurements.

The CM57 has a CATIII 600V safety rating and includes a non-contact voltage sensor built into the jaw for detecting the presence of AC voltages.

The CM57 is supplied with Martindale TL16 test leads, soft carry case, alkaline batteries and manual. All Martindale clamp meters come with a 2 year warranty.



Current AC 60.00A/600.0A
Accuracy ± 1.9% ± 5 dgt
Voltage AC 6.000V/60.00V/600V
Accuracy ± 1.2% ± 5 dgt
Voltage DC 6.000V/60.00V/600V
Accuracy ± 1% ± 3 dgt
Ohms 600.0Ω to 6.000MΩ
Accuracy ± 1.2% ± 3 dgt
Continuity buzzer ≤ 30Ω
Capacitance 6.000nF to 600.0µF
Accuracy ± 3% ± 10 dgt
Frequency 6.000kHz/10.00kHz (A), 6.000kHz to 100.0kHz (V)
Accuracy ± 0.2% ± 2 dgt
Max conductor 25mmØ
Operating environment 0°C to 40°C, <80% RH
Supply 2 x 1.5V AAA
Weight 270g approx.
Dimensions 203 x 75 x 32mm
Includes TL16 leads, case, batteries and manual



  CM55 CM57 CM69
AC Current ✔ ✔ ✔
DC Current      
AC/DC Volts ✔ ✔ ✔
Ohms ✔ ✔ ✔
Frequency   ✔  
Capacitance   ✔  
Non-contact Voltage Detector   ✔  
Auto ranging ✔ ✔ ✔
Max Conductor Size 25mm Ø
25mm Ø
20mm Ø
True RMS   ✔ ✔
Min Max     Peak
Backlight   ✔ ✔
Auto Power Off ✔ ✔ ✔
Other     Low pass filter
0.001mA resolution
Safety CAT III 600V CAT III 600V CAT III 600V




Product Note Price
Multimeter Test Leads Multimeter Test Leads
£8.45 *
Soft Carry Case Soft Carry Case
£16.48 *
* Prices plus VAT, plus delivery
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