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

Works great!

I've been using these at work and love them. Light weight, simple to use and reliable. This will not get down to the finer details of measuring resistance readings but will tell you where the weak spots are in a circuit. The lower cutoff point on this meter's scale is 20 Megaohms, well above levels I have seen circuits operating without tripping overloads or breakers. All of the problem circuits I've diagnosed with my expensive Fluke megger have shown less than 1 Megaohm from conductor to ground. I still love this meter, though, because it is so light and compact. I also like that I can attach the alligator clips and leave one hand free to wiggle wires in the conduit on intermittent problems while I press the test button with the other. I have thus far not misdiagnosed a motor with this meter but I usually go get my Fluke 1507 if I am in doubt. You will love this megger.

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.

Works as well as the commercial units within a lower range good for home AC units.

The meter works very well for megging out industrial motors. The LED readout is fairly accurate. Side by side comparison with a Fluke 1507 showed results that were close enough. I’m only checking for grounded motors anyway. The test leads could be better quality. The meter case seems fairly rugged and would withstand rigorous use. The case is very lightweight and flimsy. At best, the case would protect from dust and scratches. A thick rubber holster and better/longer test leads would make this meter perfect!

I've had one for 6 years now and it works great. It does only one job and it does it well. It's the easiest and fastest way to check windings on electric motors and compressors. If you don't know how to use it or what it does check YouTube.

A small price to pay for the info this can provide in problematic situations. Intermittent or rare failures can be the most vexing to troubleshoot. This helps with that analysis, it will find faults that even a good multimeter and physical inspection will miss.

This tool saved our team a lot of time & it was accurate.