This instrument is aimed to be mounted on front face of monitoring switchboards. The voltmeter measure in volts the potential difference (voltage) of an electrical circuit. The scale of the dial is from 0 to 500V. Accuracy class 1.5. Complient with standards IEC 60051-1, IEC 61010-1 and IEC 61000-4. The dimensions of the product are 72 mm in width, 72 mm in heigh and 75 mm in depth. please prepare a 68 x 68 mm cutout on the enclosure door.