Thats the one...apparently they light up when they detect a magnetic field, but I don't know the range / accuracy.
Mind you, WDIK's idea with the spanner will probably work just as well....
John
I use the Regin current tester to check control box output to solenoids and transformers. Also useful to check for output from thermostats to burner etc. Once you know there's current, solenoids can be felt with screwdriver or small spanner, an d you can look for spark at electrodes.
John - I do the same as oilhead with a volt sensor and a screwdriver stuck in the coil and as he says it's useful for poking into places you don't want to stick a wet finger into (saves pulling out the multimeter unless you have) If you've got the money burning a hole in your pocket it may impress a customer when they see it light up
If you haven't got a volt stick already I'd put it towards one of them (mines an RS one again given to me, I'd buy a Fluke though)
Another useful application for the volt sensor is, when working at my stepdaughters, give it to the grandson to place next to lightswitches, or kettle leads etc. It teaches him where there is danger, and keeps him away from toolbox so I can get on with job!
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