Digital Earth Resistance Tester, Earth Resistance Meter. Ground Resistance Tester, Digital Earth Resistance Tester, Earth Resistance Meter ETCR30001. Introduction ETCR3000 Digital Earth Resistance Tester is specially designed and manufactured for field measurement, adopting the ... of E-P,E-C, AC 280V/3 seconds 31.Insulation Resistance :Over 10MΩ(between circuit and enclosure it is 500V) 32 ...