Product Summary

This unit checks the polarity of loudspeaker units and makes judgment.
The result of a check is shown with a +/- LED indicator within approximately 0.1 seconds.
When the buzzer switch is set to on, a buzzer sounds if a reversed polarity is detected.
An external signal can be inputted when the selector switch is set so.

Product specifications

Polarity: + (green) − (red)
Polarity Checking Microphone:
AP-1291 (Accessory)