ST-1505 3 Wire Analog Earth Resistance Tester

  • High quality Taut Band movement.
  • Capable of measuring earth resistance and earth voltage.
  • The timer operates automatically for about three to five minutes when the “PUSH BUTTON SWITCH” and “TIMER ON BUTTON” are pressed together.
  • This will keep test “ON” for the duration of the timer.
  • Battery check function.
  • Calibration performed with supplied test leads.


  • Earth resistance: 0-10Ω / 0-100Ω / 0-1000Ω.
  • Earth resistance Accuracy: ±3% of full scale.
  • Earth voltage: 0-30 Vac (40-500Hz).
  • Earth voltage Accuracy: ±2.5% of full scale.
  • Measuring system: Earth resistance by constant current inverter 820 Hz, 2mA approx.
  • Open circuit indication: LED will be unlit.
  • Dimensions: 163(L) × 100(W) × 50(D)mm.
  • Weight (battery included): Approx. 460g.
  • Power source: 1.5V (AA) × 6.
  • Safety Standard: EN 61010-1 II 30V.