A must have for testing speakers. Very reasonably priced too.

I bought this after watching Five Car Stereo and Sonic Electronics using this. Awesome multi function tool!

for those who want a small device that can search loudspeaker crossovers, this product is essential. it also allows to find cuts in rca cables as well as to see the polarities of speakers. a simple tool, easy to use. small concern: the user manual is not provided and explanations on the net are absent contrary to its concurent the PAC. however I recommend

This is a very good way to double-check yourself it also has a test tone generator and is a lot cheaper than SMD products. This product will check speaker polarity pre out continuity and has test tone generator this is a good product the long one

good tool for the $$. you can have a test tone for checking polarity on speakers to checking that your channels are left or right .