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John Drummond Voltage Indicator & Proving Unit Kit 3.5mA 700V ac, Kit Contents 1 Long Angled Prod, 1 L-Shaped Prod and


Proving Units are essential tools used to verify the accuracy and functionality of electrical testing devices such as digital multimeters, clamp meters, and voltage testers. These portable, battery-powered devices generate a known voltage, allowing users to confirm that their testing equipment is operating correctly and safely. By simulating both AC and DC voltages, proving units ensure that no dangerous voltages are present in circuits or equipment, thereby enhancing safety and compliance with testing standards. You can learn more in our [proving units guide](https://uk.rs-online.com/web/content/discovery/ideas-and-advice/proving-units-guide).

### Why Choose RS for a Proving Unit?

Explore our range of proving units and take advantage of our comprehensive [calibration services](https://uk.rs-online.com/web/content/services/maintenance-solutions/rs-calibration) to keep your projects running smoothly as well as on hand advice from our technical experts to help your decisions. Visit RS today and find the perfect solution for your electrical testing needs from leading brands such as [Martindale](https://uk.rs-online.com/web/c/test-measurement/electrical-test-measurement/proving-units/?applied-dimensions=4294965651), [Fluke](https://uk.rs-online.com/web/c/test-measurement/electrical-test-measurement/proving-units/?applied-dimensions=4294966303), Black Star and Megger.

At RS, we understand the importance of precision and reliability in electrical testing. That's why we offer calibrated proving units to ensure your equipment performs accurately. Our calibration services are conducted in a UKAS-accredited lab, providing you with the confidence that your instruments meet the highest standards. Whether you need a new calibrated proving unit or require calibration for your existing equipment, RS has you covered.

## What Do Proving Units Do?
- Verification - they verify the accuracy of electrical testing tools by providing a known reference voltage.
- Safety - they help ensure that circuits are safe to work on by confirming the absence of live voltages.
- Compliance - they assist in meeting regulatory standards for electrical testing and safety.

## Who Uses Proving Units?

Proving units are widely used by:

- Electricians - to ensure their voltage testers and multimeters are accurate before performing electrical work.
- Engineers - for verifying the functionality of testing equipment in industrial and laboratory settings.
- Contractors - to maintain safety and compliance on job sites by regularly checking their testing tools.
- Maintenance Technicians - for routine checks and troubleshooting of electrical systems and equipment.


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835775905

845068664

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Fluke T150 Voltage Indicator & Proving Unit Kit ≤5μA 6 → 690V GS38

Martindale MARVT25 690V ac/dc Battery Powered, CAT III 690V

Martindale PD230SRD Proving Unit 230V None RS Calibration

Martindale PD440SRD Proving Unit 440V None RS Calibration

Drummond Proving Units

1 Product showing for Drummond Proving Units

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