the t.racks Phase Checker
the t.racks Phase Checker, Phase Tester, For checking acoustic transducers (loudspeakers, microphones) as well as electrical audio accessories, Consists of a signal generator and a detector, Generator with acoustic and electrical output, Output level adjustable, Detector with acoustic and electrical input (Mic int./Line in / Mic ext switchable), LED display, Power supply (per device): 1x 9 V battery (not included)