Earth Resistance Tester
3 Wire Analog Earth Resistance Tester: 1105 ER, 1805 ER, 2105 ER, 2705 ER, 4105 ER, ST-1505.
3 Wire Digital Earth Resistance Tester: 1120 ER, 1620 ER, 1820 ER, 2120 ER, 2720 ER, 4120 ER, 8020 ER, ST-1520.
4 Wire Digital Earth Resistance Tester: 2734 ER, 4234 ER, 4235 ER, 4236 ER.
