Features: 100% Brand new and high quality The DC ammeter range DC0-9.99A. Built-in shunt resistor 10A current input (do not hold full-scale input). Must use an external power supply voltage for the DC4-30V. Specifications: Measurement accuracy: 0.1% Refresh rate: about 200mS / times Display: Three 0.36 "digital tube Measuring range: DC 0A-9.99A. Input range: DC 4V-30V Display Color: Red Operating current: Less than 8mA Operating temperature: -10 degree -65 degree Input impedance: 5 ohm Reverse polarity protection: Yes Net Weight:10g Dimensions: 35 x 14 x 10 mm (1 3/8 x 9/16 x 3/8 in ) Package includes: 1x LED DC Ammeter