Check insulation, voltage limiters and surge suppressors digital, handy insulation tester Insulation test 50V ... 1000V testing overvoltage protection elements (varistors) 40 ... 1050V voltage measurement DC and AC to 600V insulation test to 9.999 GOhm Dielectric adjustable fixed values ??50V, 100V, 250V, 500V , 1000V Dielectric adjustable 50V ... 1000V in 1V steps Additional measuring point illumination Ideal for insulation tests in installations, maintenance and troubleshooting of electrical equipment Simple testing of surge arresters