CM51 300A AC Mini Clamp Meter

Martindale CM51 300A AC Mini Clamp Meter high accuracy, current only mini AC clamp meter. Compact enough to fit in a shirt pocket & with resolution down to 10mA is ideal for many applications.

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Manufacturer's RRP

82.80 incl. VAT)
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Martindale CM51 300A AC Mini Clamp Meter

The Martindale CM51 is a high accuracy, current only mini AC clamp meter.

This compact clamp is small enough to fit in a shirt pocket  (110g, 150 x 52 x 24mm).

With resolution down to 10mA it‘s ideal for residential and commercial applications.

This low cost auto ranging clamp meter has a jaw diameter of 27mm and is useful tool for electricians, maintenance teams and installers.

The clamp has a useful Data-hold feature to freeze the displayed value when used in difficult to access locations where the display may be difficult to read. There is also an auto power off function.


▶ Martindale CM Clamp Meter Series:

Martindale CM51 Key Features:

  • 27mm jaw diameter
  • Fits in a shirt pocket
  • Display hold
  • Auto power off
  • Low battery indicator
  • AC Current
  • Auto ranging
  • Max Conductor Size
  • Auto Power Off
  • CAT III 300V
  • Autoranging 40.00A and 300.0A AC


What comes with the Martindale CM51?

  • Martindale CM51 300A AC Mini Clamp Meter
  • Manual
  • Battery
  • Soft carry case



Technical Specification for: Martindale CM51 300A AC Mini Clamp Meter

Product Downloads




Handy pocket sized clamp meter

I was first introduced to the Martindale Clamp Meter about 10 years ago and it was a vital piece of equipment to record live load readings whilst I was carrying out fire risk assessments within care homes.

Unlike perhaps some of the larger, more comprehensive models on the market, the Martindale CM51 is small enough to wrap around tails by meters, cables situated in trunking, as well as cables within fuse boards. This is great for quickly checking loads and handy to have when fault finding and surveying for installing new power supplies to submains.

I would highly recommend this particular model for any electrician to carry on them while attending call outs and conducting EICR's. Martindale could improve the model by having a backlight option - as always electrical switch room lighting tends not to be the best, and also within trunking and fuse boards locations.