This Australian-made, Digital Voltmeter is an electronic device used to measure voltage in electrical circuits using a digital display. This is ideal for classroom use as there are no knobs, switches, or fuses to replace. It is also relatively affordable compared to delicate analogue meters. The meters are color-coded for easy identification from a distance in a classroom setting. Voltmeters have a band in a mustard color, while Ammeters have a green band. In addition, large lettering displays the meter's range and resolution, aiding in identification. *auto power off after 20 minutes Dimensions: 120mm (L) x 100mm (W) x 40mm (H) Weight: 0.20 kg Display: LCD Battery: Standard 9V, type 216 Product Code Type Range Resolution Manual SE.LB2123-200 DC +/-200V 0.1V See Here SE.LB2126-001 AC 200V 100mV SE.LB2123-001 DC +/- 20V 10mV See Here SE.LB2123-010 DC +/-2V 1mV See Here