V.O.P (Velocity Of Propagation) settings only required Accuracy: ± 2% of reading (accuracy to 50 cents across the entire range) Very large high-resolution backlit LCD display Cable length calibration function Internal library of 39 standard cable types 20 internal memory locations for custom cable types Auto power off Tone generator (oscillates from 910 to 1100 Hz) Line voltage detection: displays "OUCH" message and shuts down Safety protection (up to 250 V RMS) The device is for sale and the location is Hay Luban, Exit 33 Contact privately