Description: Sensitive reaction and easy to installation. Unopened, undamaged and durable! 7-IN-1 DC Combo Meter, accurate! Suitable for project monitor power/DIY Charge meter/Car/Battery Character Color: White, Blue Specification: Voltage measuring range: DC00.0-99.9V (100V / 10A version); 0.00-33.00 V (33V / 10A version) Power measurement range: 0-99.99W-999.9W (100V / 10A version); 0-99.99W-330.0W (33V / 10A version) Current measuring range: DC0.00-9.99A Measuring range time: 0-99h59min Temperature Measurement Range: -15 ° C ~ 60° c Gamma Capacity Accumulation: 00.000-99.999Ah Range of energy accumulation: 0-9999.9Wh (100V / 10A version); 0-3300.00Wh (33V / 10A version) Measuring accuracy: ± (0.5% + 1 digit) (100 V / 10A version); ± (0.3% + 2 digits) (33 V / 10A version) Current Measurement Accuracy: ± (1% + 2 digits) Product Size: 48mm * 29mm * 22mm / 1.89x1.14x0.87inch (L * W * H) Package Includes: 1 Piece of Power Energy Meter Note: After a long time use, due to the aging of components or temperature variation, it may appear tiny error when measuring the small current. To avoid this error, you can unplug the current wire socket and keep pressing the button to connect power supply until the screen display "AAA", then loose button.