The insulation resistance function on this device has an accuracy of ±5% of full scale and can measure the insulation resistance of up to 1000MΩ. This instrument is also capable of measuring AC and DC voltages along with a battery check function. The DM509S is equipped with the MΩ (insulation resistance) measuring switch that enables both one-shot or continuous measurement.
Meter includes test leads, carrying case with strap and instruction manual.