When returned to service, such pairs develop noisy static in a relatively short period of time. The leakage test uses 135 volts to punch through the oxide layer and reveal the fault. Determines stressed noise susceptibility of dry and working pairs. Measures resistance, ac/dc volts, and capacitive kick. Minimal drying effect in all ranges. Single setup for testing tip-ring, tip-ground, adn ring-ground.Provides tone for twisted pair or crossed conductor identification. Tempo research sidekick 7b telephone twisted pair meter cable testers.