/diy/ - Do It Yourself

>>1513252
I use those mini 2- and 3-wire voltmeters all the time. (if you're paying 7.95 for those you are getting ripped the fuck off)
they don't usually come very accurate so you have to make sure to calibrate them (there's a pot on the back for that). once calibrated they seem to be very linear and don't drift.
that big power meter one if I'm not mistaken does NOT have a calibration pot. there are a bunch out there based on pretty much the same board that are all similar with different features. none of them can be calibrated.
I used this one, pic related, recently. no calibration but it was dead on balls accurate from the factory, and one of few that can read tenths of a milliamp. sold by DROK on amazon.