Supco M500 Insulation Tester/Electronic Megohmmeter with Soft Carrying Case, 0 to 1000 megohms Black

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

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.

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

Excellent value for money. I work in commercial industrial A/C and megging out motors is something I do on a regular basis. This thing is fairly accurate, I've tested it alongside a $1500 AEMC unit and it worked just fine. I wouldn't recommend it on stuff much bigger than 25hp. It's simply not precise enough to keep a trending log. However for small compressors, blower motors, etc, it works great. It's also good for testing wiring inside units for those "intermittent" electrical issues we love to run across. Downside, the leads are far too short.

Really nice product

I thought that I would use this a lot. I don’t use it a lot. I don’t use. It is bad if it’s your motor could put power to it don’t move is definitely bad or maybe you have a bad capacitor. If you have a meter and you know how to use it same thing it is a nice tool though

I do maintenance for living and this helps identify those units that ohms out well but just don't seem to be working to full capacity.