MASTECH MS6812 Network Cable Tester Line Tracer Telephone Function: Ideal for installation, commissioning, maintenance of telephone lines and other wires or cables. Detect cable or wire continuity without damaging insulation. Trace cables or wires and diagnose breakpoints. Receives audio signals on a cable or wire (telephone line). Identify the status of the work phone line (clear, ringing, busy). Sends a single or double alternating tone to the subject cable or wire. Includes a transmitter (MS6812-T) and a receiver (MS6812-R). Professional and safe operator tool. Specifications: Transmit audio frequency: 1.5kHz Receive frequency range: 100300kHz Power supply: 6F22 (9V) Receiver size: 23.8 x 4.3 x 2.6cm Transmitter size: 14.5 x 3.5 x 2.5cm Receiver weight: 106g Transmit Weight: 114g Package size: 25.