The HTT-1R Medma simulates the following failures: Ground Continuity Chassis to Ground (0.01 ohm), and/or High Leakage Line to Ground (424k ohm), and/or Dielectric Withstand Failure (Arc View window displays an arc at 750Vac ± 400V). The HTT-1R can also be set to simulate passing tests: Ground Continuity Chassis to Ground (0.025 ohm), and/or Normal Leakage Line to Ground (848k ohm), and /or Dielectric Withstand OK (up to 3000 volts) Arc Testing is at 750 ± 400Vac. Results visible through Front Panel Window. Works with any manufacturers Dielectric Withstand or Ground Continuity Tester. The HTT-1R simulates the failures and your tester should return results consistent with the switch settings on the front panel of the HTT-1R The HTT-1R is a passive device. No batteries or power is required. Verifies proper operation of your equipment in less than a minute. Portable. Light weight. Simple to operate. Saves time. For testing of Ground Bond Testers up to 30A.. 1 year warranty.