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AtHelper

Neon Circuit Tester(A). Multi tests both, Watt tests the voltage level and clamp is the same as a watt meter

AL2006


A neon 'tester' is just a little neon light bulb that glows orange
when it touches a point of more than maybe 90 volts or so. 
When it lights up, you can tell that it's touching a live point, but
you can't tell from the brightness of the glow what the actual
voltage is at that point.

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