Martindale CM51A 300A Mini Clamp Meter

Pocket sized budget clamp meter measures upto 300A AC with 10mA resolution on the lowest measuring range. Jaw size fits conductors up to 27mm diameter
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Martindale CM51A 300A AC Clampmeter

The Martindale CM51A is a pocket sized clamp meter, which reads AC current up to 300A. The low cost CM51A autoranging clamp meter has a jaw diameter of 27mm and is a handy tool for any electrician, HVAC engineer or anybody with a requirement for a small clampmeter that measures up to 300 Amps ac. This Martindale clampmeter offers 10mA resolution on the lowest 40A current measuring range and a resolution of 100mA from 40A to 300A AC. The auto ranging function allows the Martindale CM51A clampmeter to select the best measuring range to speed up current measurements. Additional features of the Martin dale CM51A clampmeter include display hold and auto power off.

Martindale CM51A 300A AC Clampmeter Key Features:

  • Measures up to 300A AC with 100mA resolution
  • Measures up to 40A AC with 10mA resolution
  • Pocket Size
  • Low cost
  • Data Hold - ideal when working in confined places when you can't see the display
  • Auto Power off - battery save feature
  • Ideal for conductors up to 27mm diameter

Supplied with soft case, battery and instruction manual for Martindale CM51A Clampmeter.

Range   Resolution   Accuracy   Max. Input Current
40.00A   10mA   ± 1.8%rdg±5dgt   300A (Max. 300V)
300.0A   100mA   ± 1.8%rdg±5dgt   300A (Max. 300V)
  • Frequency Response: 50~60Hz. 0~0.4A add 5dgt
  • 40Hz ~500Hz, add 1.5% to above accuracy.
  • Battery warning: BAT symbol is shown.
  • Sampling rate: 2.5 times per second.
  • Display hold: Displays are held by DH key.
  • Overload protection: AC current; 400A AC (300V Line) for one minute.
  • Overvoltage: CAT II 300V
  • Operating temperature & humidity: 0°C to 40°C, less than 80% RH.
  • Storage temperature & humidity: -10°C to 50°C, less than 70% RH.
  • Temperature coefficient: 0.1 x specified accuracy / °C for 0°C to 18°C & 28°C to 40°C.
  • Dielectric strength: 3.7kV AC for one minute (between case & metal parts).
  • Safety: EN 61010-1, EN 61010-2-032 Overvoltage Cat. III 300V, Class II.
  • EMC: EN 50082-1:01.92 & EN 55022:08.94 + A1:05.95 + A2:97
  • Power consumption: Approx. 5mW (100 hours continuous operation).
  • Power supply: One 3V CR2032 battery
  • Auto power off: Power turns off automatically after 12 minutes.
  • Conductor diameters: Maximum 27mm
  • Dimensions & weight: 150 x 52 x 24mm, 110 grams