Functions: Display: 1999 counts Diode Check Continuity Check Auto range and manual range Data Hold MAX value measurement Back light Check Net Cables: T568A, T568B, 10Base-T Phone Check: Identify the state in the working telephone line; Busy, ringing or clear. Tone: Judge continuity of the cables or wires. Track the cables or wires, and diagnose the break point. Net Cable Check : Test for open circuits, shorts, miswires, reversals, split pairs and LCD display the test result. Shield detection tests a cables shield integrity Easy to read fault display and high speed testing. Debug mode for detailed fault identification results. Low Battery indication Auto power off None Contact Voltage Detect.