Hioki insulation resistance testers or megohmmeters feature all in one designs including built in rugged cases and test lead storage compartments. The IR3455 is a 5 range, 250V to 5000V digital insulation resistance tester offering up to 10TOhm of insulated resistance testing. High performance features include bargraph, built in memory, leak current and voltage testing, and DAR and PI calculation capabilities to help shorten work time associated with field insulation testing.