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Martindale CM79 AC DC TRMS Clamp Meter

The CM79 is a new pocket sized high performance TRMS AC/DC Clamp meter measuring AC and DC current up to 600A, AC/DC voltage and resistance with continuity test.

Next Day Delivery (subject to availability)

£92.95 exc. VAT £111.54 inc. VAT £166.80 inc. VAT
  • Tests up to 600A
  • Current AC/DC
  • TRMS
  • Data Hold
  • Resistance Measurement
  • Continuity Measurement
  • Voltage AC/DC
  • 25mm Jaw Size
  • FreeDelivery
  • 30DayMoneyBack
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  • Description
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Martindale CM79 AC DC TRMS Clamp Meter

The compact rugged design enables accurate and reliable DC current measurements down to 10mA resolution in applications including PV installations, battery monitoring and electric vehicles.

The TRMS capability ensures accurate and reliable AC current and voltage measurement for distorted waveforms caused by today’s power electronics and non-linear loads found in modern lighting and power supplies.

Features include an elliptical jaw to accommodate bus bars up to 35x15mm, thumbwheel for single handed operation, auto ranging for ease of use, auto power off and low battery indicator plus a high contrast backlit display. Useful functions include hold and min/max hold for monitoring maximum loads, start up and charging currents.


The CM79 TRMS Clamp Meter Comes Supplied With:

  • Martindale TL16 test leads
  • Soft Carry Case
  • Alkaline Batteries 
  • All Martindale clamp meters come with a 2 year warranty.


Martindale CM79 TRMS AC/DC Clamp Meter
DC Voltage  
 Range  Resolution  Input Impedance Accuracy 
 600V  0.1V  1M  1.0% + 2
 Overload Protection: 660V DC or AC rms
 AC Voltage (True RMS)
 Range  Resolution Input Impedance   Accuracy (50 to 500Hz)
 600V  0.1V  1M  1.2% + 5
 Overload Protection: 660V DC or AC rms
 DC Current
 Range  Resolution  Accuracy  
 60A  0.01A   2.0% + 5  
 600A  0.1A  
 Overload Protection: 660V DC or AC rms
 AC Current (True RMS)
 Range  Resolution   Accuracy
 60A  0.01A   2.0% + 5 3.0% + 5  
 600A  0.1A
 Overload Protection: 660V DC or AC rms
 Range  Resolution  Open Circuit Voltage  Accuracy
 1000  0.1  3V DC  1.0% + 2
 Overload Protection: 660V DC or AC rms
 Open Circuit Voltage  Audible Indication    
 3V DC 40    
 Overload Protection: 660V DC or AC rms

Delivery Notices

Updated March 2021

During the current situation surrounding the effects of the Coronavirus pandemic, logistics from every company are under immense pressure to deliver goods on time so we have taken the decision to
temporarily limit our services rather than let our customers down. We hope you will understand our position on this and we apologize unreservedly for the inconvenience we know it will cause.

Please note that ALL orders placed before 3:00pm are shipped same-day (unless additional services are required).
The stated transport times above have some scope for adjustment built-in for the Covid-19 situation. Carriers themselves also have their own extended workload and limitations at this time which are beyond our control.

Orders requiring calibration 

Whilst we take the greatest care to get all orders dispatched and delivered to you in the stated time frame, orders received PM and requiring
calibration may on occasion miss dispatch that day, according to the complexity of the calibration. Be assured they will ship on the next dispatch
this in most cases should not add more than 24 hours to your delivery.

Bank/Public Holidays

Predicted delivery times are based on regular trading days Monday to Friday. Public holidays, bank holidays and weekends are outside the usual scope
of our dispatch and subject to activities/holidays of our carriers and therefore may incur additional days lead time to your order.

*UK Mainland (Revised March 2021)

Service  Price 
Standard FREE 2-3 Day Courier Delivery – UK Mainland only - Zones A & B - Order value OVER £75.00 ex VAT - Order by 3:0pm FREE
Standard FREE 2-3 Day Courier Delivery – UK Mainland only - Zones A & B - Order value UNDER £75.00 ex VAT - Order by 3:0pm £4.75
Next WORKING Day (excludes Saturdays, Sundays and public holidays)  – UK Mainland only - Zones A & B  - ANY order value - Order by 3:0pm      £7.75
Saturday ANYTIME Delivery - Order by 3:0pm £9.95

New Postage Map Sept 2018>

Delivery Surcharges

Because of the high cost of carriage, we regretfully need to apply a surcharge on all deliveries made in the following regions:

  • Zones A & B  - Mainland delivery rates apply. 
  • Zone C - Scottish Highlands (Charges are calculated at the checkout).
  • Zone D - Outer Hebrides, Orkney Isles, Shetland Isles, Isle of Man, Scilly Isles, and Channel Islands (Charges are calculated at the checkout).
  • Zone E - Northern Ireland (Charges are calculated at the checkout).
  • Zone F - Republic of Ireland (Charges are calculated at the checkout).

Offshore Services

All offshore deliveries are a 3-4 day service as standard. This includes Channel Islands, Northern & Southern Ireland, Scottish Islands, Isle of Man and the Scilly Isles.

International delivery

International delivery charges are automatically added to your order at the checkout. For any questions regarding international deliveries please contact us at


All export inquiries should be directed to the export division before placement of order.

If no shipping option is available to your selected country please call us FREE on 0800 0224 060 to purchase your items.
All stated prices are subject to VAT at the current rate where applicable.