Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit

I have used this meter now to test over 500 capacitors and it has performed flawlessly. The only situation I would advise users of is not to relay only on the auto-ranging capability of the meter. Auto-range works great but for some capacitors the ESR is close to the limit of two ranges and the meter will jump back and forth trying to resolve the resistance. If this occurs simply press the mode range button once or twice until the reading stabilizes. This meter can be used for in-circuit testing of capacitors as well but so far I have not needed it for that.

Love this thing, but the leads slip around when trying to clamp them and they are very short they should be longer and have the ability to put tiny probes on as well!!

Troubleshooting a plate style subwoofer power amp. Quickly spotted out of spec caps. Nice unit and great to be able to test without having to remove them from the circuit.

This is a very good ESR tester that's been a welcome addition to my tool set. It's able to read ESR values in-circuit (no desoldering) and does really well detecting the proper capacitance values in automatic mode.The one criticism I'd offer for this device is that the supplied test leads are simply awful. They have alligator clips on them which are too coarse/large for most capacitors, and are completely useless for anything surface-mounted. In the end, I (as have others) replaced them with a set of short Kelvin clip leads, which are dramatically better and easier to work with. The leads have to be short or the meter won't zero properly, so buyer beware when getting replacements.Now that I have this device (and some decent leads), I'm easily able to determine which capacitors I need to replace in a circuit.

I'm am amateur at repairing circuits, but this device is great for testing capacitors in circuit which is very helpful. I've already repaired a few devices with it by finding bad caps. The only tricky issue with this tester are the short leads which others have pointed out, but that is due to it being so sensitive that the leads must be short for it to work. You can snip off a short piece of wire and put in each alligator clip to make the test leads a little more useful for getting in hard to reach areas. Overall this tester is a must have for doing any circuit repair, especially looking for bad caps.