Loudspeaker Polarity Tester
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Rk5991N Microphone polarity Tester
RK5991N tortor ligula tester potest distinguere positivum et negative verticitatem cuiuscumque genus, magnitudine, materia, impedimentis de loudspeaker headset, movens coil receiver automatice et cursim.
Mensuræ Pulsus Width: 0.4ms