Some time ago I bought a cheap contactless voltage tester. This is a device that indicates presence of high voltages (AC mains mainly) near the probe with a sound and is powered with two AAA batteries.
I do not need it often, but like so many devices, when I do need it it is really useful for diagnosing power faults (for example: this device seems to be receiving mains voltage so fault very likely is inside it.) And just as a reminder: even if these don't indicate voltage presence, you should always treat mains wiring as it were powered!
Now, this specific device unfortunately does not have any kind of power switch for detection (it has a flashlight at the other end which does have button, yes, but that does not turn the voltage detection off). And since it takes only one time forgetting to remote the batteries, the end result is inevitable:
No, despite colors this device has nothing to do with Fluke.
Surprisingly, it still worked when in this condition, both detection and LED flashlight. The physical damage to the battery from trying to remove it forcefully - other battery is still deep inside and I don't even bother trying to get it out. I only noticed the situation since there was this white crap around the battery cap.
As my personal tool-buying rules say, I've bought cheap, found it useful, so now it is time to get a better one. And this time it absolutely must have a physical power switch.
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