RESISTANCE: Cropico’s DO4000 range of rugged portable digital milli-ohmmeters includes features to provide accurate measurements of track joint resistance and check the accuracy of power distribution joints. The meters are also suitable for quick checking of signal wire integrity.

The DO4000 enables forward and reverse current measurement with auto averaging and a true current zero. A long scale length and a selectable measurement range from 40 mW to 4 kW allow resolutions between 10 mW and 1 W.

The 4001 model includes temperature compensation, with preset coefficients for copper and aluminium and user-settable coefficients for other materials.