The DMR20-10-DCM-R-C is a 4-digit auto-ranging DC Voltmeter, designed to measure and displays the outputs the most popular DC power systems. Simply connect any 6 to 75VDC power source and these meters are fully operational, no additional components or power sources are required. Their large, 0.30"/7.6mm, bright LED displays can be easily read from 10ft away (3m). These auto-ranging meters accurately display DC voltages with 0.01V in the LO-range (below 51V) or 0.1V resolution in the HI-range (above 51V). A built-in resettable fuse assures long term reliability. All DMR20-10-DCM's employ a 13-bit A/D converter and precision metal-film resistors to achieve outstanding performance over an operating temperature range of -25 to +60°C. The DMR20-10-DCM is housed in a rugged, round polycarbonate case that provides excellent protection against moisture, dust, shock and vibration.