On Friday, July 3, 2020 at 7:14:22 AM UTC-7, Ralph Mowery wrote:
I checked the first half dozen or so against our NIST-traceable meters, and also found good agreement as long as the battery was fresh. One meter produced absurdly high readings when the battery was low; the only way to diagnose this was to put in a fresh one since the meter did not have a LO BAT indicator (I assume it was too low for the band gap reference).Just for the fun of it, I did test the 3 \'free\' Harbor Freight meters on
AC and DC yeaterday. From 0 to 25 VDC the HF meters were within about
.5 % of the Fluke meter. On AC up to 130 VAC they were around 3 %. One
was always low and the other 2 were always high.
So they are accurate for most anything around the house for most people.