Supco M500 Electronic Megohmmeter, 0 to 1000 Megohms

I bought this Supco M500 tester to validate the motor on our sander. I was blown away by the portability, compactness, and the magnets on the ends of the leads. I also bought a competing unit with higher voltage and a display to tell me actual values, but I am very conflicted because the thought that went into this Supco unit is so great. In terms of a unit that is quick, easy to use, this Supco device wins, hands down. I could see the shorter leads being an issue eventually, but they're that short because they fold up in the back of the unit. I can't stress enough how convenient the magnets on the end of the aligator clips are. I can pop them onto screw terminals and very quickly test through a bunch of circuits without having to hold my fingers in the danger zone or question whether I slipped and caused an incorrect reading.

Great value and fits in my toolbag. I use it often checking compressors and motors.

One of the easiest, and quickest ways to test a compressor and insulation on the windings

As a technician, having a dependable megohmmeter is a must — and this one delivers. Right out of the box, the build feels solid, with a rugged, rubberized housing that gives confidence it can handle the field. I’ve used it for testing motors, compressors, and insulation on wiring, and the readings are consistent and accurate every time. The display is bright and easy to read, even outdoors. I also appreciate the auto-discharge feature after testing — a safety must. The leads are quality too, with strong alligator clips that hold securely during testing.

Needed to check for insulation degradation between my house and a distant outdoor subpanel. Easy to use, simple to interpret. Took off one star because... C batteries, really? I have a stockpile of batteries, but exactly two Cs in the entire house, had to raid the kid's camping lantern.

Came as advertised works well

This item mega OHM meter is what I needed for diagnosing mini split system systems… it is required for testing the windings of a mini split compressor

This tool allowed me to troubleshoot and repair my air conditioner and saved me a lot of time and money.