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.