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HIOKI 3143 Earth HiTesterGround resistance meterSay goodbye auxiliary grounding rods with the 3143Measure ground resistance on paved roads. Auxiliary grounding rods not necessary. Large digital display for easy viewing. Soil-resistant design and superior durability.Basic specifications (Accuracy guaranteed for 1 year)Ground resistance : 20.0 to 49.9 ohm (±10 % rdg.), 50.0 to 500.0 ohm (±5 % rdg.)Principle of operation : Voltage comparison method (Measurement of voltage at loop impedance serial resonance)Open circuit voltage: 0.9 V ACpeak typ. Testing current: 3.6 mA AC max. with terminals shorted, Testing frequency: 100 kHz to 1.5 MHzFeatures : Energy saving mode, Resonance indicator, Battery checkPower consumption : LR6(AA) alkaline batteries × 4, Continuous use: 8 hoursDimensions and mass : 155 (6.10in) W × 98 (3.86in) H × 49 (1.93in) D mm, 380g (13.4oz)Supplied accessories : MEASUREMENT CABLE 9265 (black 1 m (3.28 ft), red 20 m (65.62 ft), one each; CABLE WINDER × 1), LR6(AA) alkaline batteries × 4, CARRYING CASE 9338 × 1