Digital Meter - Various Inputs: Type - Digital Voltmeter; Inputs - DC Voltage; Supply Voltage - Nominal - 10-30VDC; Operating Temperature - -20 to 65 deg C -4 to 149 deg F; Enclosure Material - Black Plastic Bezel; Mounting - Panel Opening HxW: 0.94 x 1.88 in 24.0 x 48.0 mm; Manufacturer Series - MCR-SL-D