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 ... so on. 2. Technical Specifications: 1.Function: Earth resistance measurement, Earth voltage measurement, Low resistance measurement 2.Power Supply: DC 9V ...