TOA ZM-104A Impedance Meter, Measures Impedance of Speaker Lines Up to 100k Ohms, Zero Adjustment for Accuracy On All Ranges, Easy to Read Meter Calibrates Directly in Ohms

I install commercial sound systems for a living, and this is a tool I can't live without.

My opinion as an audio service professional for 30+ years with a major national company, this is the best impedance meter ever made. Simple to use with accurate results. And totally repairable by TOA if you happen break it. If you’re gonna buy an Impedance Meter spend a few extra dollars and buy this one. The only little complaint I do have, plastic the “hinge” wears out on the front cover. Mine has small metal hinges riveted in place now, but you can easily buy a new case if your desire.

Arrived DOA. Packaging was in good shape but meter not work. Will be returning for a refund.

I first purchased this earlier last month. But that on arrived dead. I spoke with the manufacturer about it and after our discussion they determined it was a dead piece. They asked me to return it to the seller and request a new one. So I did and it took a month to receive it. Not sure why it was supposed to be an equal exchange. I did not get any emails from them. But it arrived today I will update on if this one works properly.

I have used versions of this meter since 1986. I've worn out two over all that time and now it's time for another one. It may not be high-tech but it does a fantastic job. It works especially well reading actual impedance through a Transformer setup. The tone it generates also is helpful in locating hidden speaker devices. At the price it sell for here on Amazon, the one I'm getting is costing the same as the one I last purchased back in 1993 so I consider it a good deal.

25 years in commercial sound, used the Raymer bridge which was OK but unreliable. THen I got the TOA. Any tech worth his salt should own one of these. Durable, accurate, wide range, simple. I bought a second one as a back up they are so versatile. I think mine were 102s and came with a schematic, a few transistors and resistors damn, you cant beat a good design(r)

it did not work. needle was stuck.