Install Bay FH-168 Speaker Phase/Polarity Tester

The Polarity Tester gets held in front of each speaker while the test tone plays, and a Test On/Off button lets you start testing when the IB-FH168 is in position. A microphone at the top of the tester will pick up the test tone while LED indicators for +Polarity and -Polarity will light to indicate if the speaker polarity is in-phase or out-of-phase. The IB-FH168 is powered by a 9V battery (NOT INCLUDED) and features a Low Battery LED indicator.