A leakage and continuity test unit for checking the ground impedance and leakage current in a medical instrument to ensure that the medical instrument is properly grounded and does not conduct an excessive amount of leakage current through the chassis. The unit includes a test probe which is interconnected...http://www.google.com/patents/US3963981?utm_source=gb-gplus-sharePatent US3963981 - Leakage and continuity tester
