Parameters-Measuring voltage DC 4.5V-100V; current 0-50A. Applications-Monitor storage batteries, solar panels, model railroads, , motorcycles, house batteries, motors, etc. Display-0.39 inches (about 0.9 cm) clear and bright LED screen displays voltage and current values. Calibration-with voltage and current calibration potentiometers. Attention-The shunt should be connected when wiring, otherwise the meter will be burnt out. Material: plastic colour: As shown Package Contents: 1 x voltage ammeter 1 x 100A_shunt Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.