UCTRONICS 0.36 Inch Mini DC Voltmeter 2 Wires 2.5-30V LED Display Digital Voltage Tester Meter, 5 Colors

UCTRONICS 0.36 inch mini digital voltmeter is a 2-wire DC 2.5-30V voltage tester meter. It lets you simply and accurately measure the voltage of motorcycles, automobiles, 18650 batteries, lithium-ion batteries of mobile phones, Ni-MH Batteries and other battery packs. SPECIFICATIONS Detection Voltage: DC 2.5V ~ 30V Working Voltage: DC 2.5V ~ 40V Display: 0.36" LED Wire Length: about 6" Mounting Hole Center Distance: 1.1" (28mm) Refresh Rate: about once per second Accuracy: 1% (+/- 1 digit) Operating Temperature: 14 ~ 149 °F(-10 ~ 65 °C)  Color: 1 pcs red (2.5-30V) 1 pcs yellow (2.5-30V) 1 pcs blue (3-30V) 1 pcs green (2.7-30V) 1 pcs white (3-30V) FEATURES Can be calibrated: the screw on the back can be tuned to calibrate. Reverse Polarity Protected: it will not be burned when the connection is reverse. The decimal point shifts automatically: the meter shows two decimal places when measuring the voltage below 10V; it shows one decimal place for voltage above 10V.