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Martindale Metrohm 7A501C Safety Insulation Tester

The Metrohm 7A501C safety insulation tester, originally designed for use in hazardous areas - such as mines and petrol sites.

Next Day Delivery (subject to availability)

£848.25 exc. VAT £1,017.90 inc. VAT £1,102.80 inc. VAT
  • Carry Case Included
  • Insulation 500V DC 0-50MΩ.
  • Continuity 0 to 50Ω
  • Test Leads Included
  • 1 Year Warranty
  • Complies With BS1259
  • FreeDelivery
  • 30DayMoneyBack
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Metrohm 7A501C Safety Insulation Tester

The Metrohm 7A501C safety insulation tester, originally designed for use in hazardous areas - such as mines and petrol sites.

With the introduction of the new ATEX regulations, the item no longer meets requirements for intrinsically safe products, however this product has been in active service for 45 years in hazardous areas.

There are no other testers of this kind on the market, that we know of, which fully meet ATEX requirements, therefore the use of this tester should be decided upon by a suitably qualified and knowledgeable person. Whilst this tester does not qualify for ATEX approval, safety officers should evaluate the risks of failing to perform adequate electrical safety testing. Below are the details of the availability and compliance statements issued after the changeover from Intrinsically Safe to ATEX regulations. As such this product is only available for sale where the intended use is outside the EU.

The 7A501C is supplied with test leads, carry case, battery and safety tool to remove battery cover.

The 7A501C Is Supplied With:

  • 7A501C Safety Insulation Tester
  • Carry case
  • Test Leads DFK0113
  • Instructions Manual

Key Features:

  • Tautband analogue meter
  • Insulation 500V DC 0-5050MΩ
  • Continuity 0 to 50Ω
  • Complies With BS1259
  • 1 year warranty included


ISSWWW and Martindale Electric

Founded in 1928 and also owns Edgcumbe Instruments Metrohm® products, as well as the John
Drummond Engineers range of test lamps. They are a British owned company, based in Watford, just 5 minutes from junction 5 of the M1. Their product range helps electricians and maintenance engineers carry out portable appliance testing, check fixed wiring for 17th Edition and Part P testing, safely prove dead, and measure everything from light and sound levels to microwave leakage and power consumption.

We are proud to be able to offer Martindale's products and services and have done so for many years.

Metrohm 7A501C Safety Insulation Tester

Insulation Range 0 - 50MΩ
Test Voltage 500V DC +/- 10% across 1MΩ
Short Circuit Current <2mA
Accuracy +/- 1.6mm of scale arc length
Range 0 - 50Ω
Test Voltage nominal 200mV
Short Circuit Current <26mA
Accuracy +/- 1.6mm of scale arc length
General Specification
Complies With BS1259
Supply 1.5V AA IEC batteries
Housing Shatterproof ABS case
Dimensions 32 x 82 x 60mm
Weight 600g approx

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.