For that ultra high scientific research into testing like checking out whether a battery is dead or alive, or just weak, or whether a fuse is up to snuff, or checking an outlet for voltage, I have a cheapo digital Cen-Tech HF multimeter that I got on sale for $3.99. In fact, I have two of them. How 'bout that.
I also have a cheapo analog multimeter, that I can use to check if my cheapo digital multimeter is workin' OK. I might be using them when installing a kitchen, or wall system and moving or installing outlets. As far as whether a line is hot or not, two wet fingers could tell me that.
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And a guy who is into electronics and not into ww probally measures length with a yard stick and the width of his knuckle.
regards,
Charlie A woman is only a woman, but a good cigar is a smoke.
Rudyard Kipling
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