Martindale PD240 240 V Proving Unit, Yellow

Any homeowner who does DIY work on their electrics should have one of these, as well as a 2 probe voltage tester. It is the best way to ensure that the circuit / socket etc you are working on is 100% definitely dead and could prevent death or serious injury. It's very easy to use - once the battery has been put in, just stick your probes into the holes and you should get a reading of 240 volts, thus ensuring that your probes are working correctly. You can then use your probes on the electrical socket you're working on, testing all combinations (i.e. neutral + earth, neutral + line, earth + line) to ensure that it's dead (if it's live, your probes should light up, as they did when you tested them in this tester initially), and then finally, you should test your probes again in this tester to make sure they are still working and have not failed after the initial test. It seems a bit over the top to do this test before and after, but it could save your life. The unit states that it only takes an alkaline battery, but I used a 9 volt lithium one from Energizer and it seems to work fine. I prefer lithium batteries and they don't leak / corrode (well, so they claim) so hopefully I won't dig it out of my toolbox in 6 months time to find the battery has leaked all over it! It's a shame it doesn't come with a protective case though. It's quite a pricey tool so some protection for it would have been nice (would prefer a case than a battery).

I would give this device a perfect score; if quality were measured on a scale, I would give it a 9

Very good product trusted manufacturer.

Works just fine. Apparently it goes hand-in-hand with the voltage tester. If you use a voltage tester, you need one of these as well. It's a simple bit of kit that provides 2 contacts with 240v DV between them. That's all. Extraordinarily expensive for what it is.

as expected

A Very Simple & Very Important piece of kit

Didn’t work when it arrived smelt of burning so returned it , bought a different one and that worked fine and Amazon refunded in full thanks

Small size with handy belt clip for use on person or with cable tie enabling it to be lashed to top of steps through those convenient holes provided on top platform on all fibreglass ones I've seen.