The BESANTEK BST-IT815 15kV High Voltage Insulation Tester is designed for testing the insulation resistance of cables, motors, generators, transformers, insulators, high-pressure switches, wiring installations, and more. A bargraph indicates test voltage, allowing rise and decay to be observed. Up to 200 measurement results can be saved in the memory and recalled on the display. The auto-hold function can be used to freeze the reading, while optical USB to RS-232 data transmission allows readings to be easily transferred to a PC.