The 1810D is the Basic test Equipment an Electrician cannot do without.1810D is a Dual Function Test Instrument used to Verify electrical Wiring Connections and the Functioning of Earth leakage / Residual current detector devices by forcing the ELCB/RCD to trip. This verifies that the protection device opens the mains power supply circuit when a current higher than a certain amplitude flows into the ground/earth wire.This ensures the Electrical installations meet safety and regulation requirements.