RioRand DC Volt Amp Meter 2in1 Digital Amperemeter Voltmeter LED Tester Blue Red 0-100V/10A Car Battery Monitor Powered by RioRand Advanced Technology Operating voltage:DC 4.5 ~ 30V Measure voltage: DC 0 ~ 100V Measure current:10A (measure directly,built-in shunt) Display: three 0.28" LED digital tube ;Display color: Red and Blue (2-color display)