The TS19 Test Set combines all the essential test set features at a value price. The TS19 Test Set was specifically designed for in-house telecom technicians.Its high-impedance monitor prevents accidental disruption of service from clipping onto a data line while in monitor mode thus ensuring the integrity of critical data lines. Features such as tone (DTMF) or pulse operation talk/monitor capabilities polarity test button and last number redial make this test set the perfect combination of features and price.

The LED indicates polarity. The red LED lights if the red test lead is connected to the Tip (positive) side and the black test lead is connected to the Ring (negative) side