This Australian-made, Digital Ammeter is been designed to withstand rough handling by students and is a great addition to any learning environment. 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.LB2122-001 DC Amps +/-20A 10mA SE.LB2125-001 AC Amps 20A 10mA See Here SE.LB2122-010 DC Amps +/- 2A 1mA See Here