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When I say "backup" it means I have a couple of them, one in the house and one in the truck incase I don't have a good meter with me.
I buy a new "good meter" every few years, since it is cheaper than sending the meter off for calibration.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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