Review on 🔊 uxcell Automotive Speaker Audio DIY Phase Tester PH Phasemeter - Black by Rick Ross

Don't expect anything too high tech. This is a very simple device that takes some getting used to. Once you get comfortable with it and understand how far you need to keep it from the speaker, it will do the job. This unit does not come with a CD, so you'll need to go online and download the audio tracks to do the actual polarity test (which can be a bit tricky to find). Also, the green light for positivity is very dim and you need to work in a darker place or cover it with your hand to see it.