MS5201 DIGITAL INSULTATION TESTER,IEC1010-1 CAT III 600V, CAT II 1000V,Data hold, ... Sound and flash alarming,Battery powered MS5201 DIGITAL INSULTATION TESTER FEATURESDesigned to international safety standard IEC1010-1 CAT III 600V ... , digit is 22mm highInsulation resistance: 200MΩ/250V±3.0%, 200MΩ/500V±3.0%, 0 ~ 1000MΩ/1000V±3.0%, 1000 ~ 2000MΩ/1000V±5.0 ...