True RMS self-powered AC voltmeter fits 30.5 mm / 1.20 inch panel cutout

The voltmeter fits an industry standard 30 and 30.5 mm / 1.2 inch round panel cutout. The 7.6 mm / 0.3 inch four-digit LED display is housed in a rugged round polycarbonate case that provides protection against dust, moisture, vibration and shock.