Operates off of 12V external power supply (machine battery/charging system)Features digital numerical readout, as well as a bar graph displayWaterproof, rugged designEasy to read, clear vivid displayLarge buttons make changing functions easy, even when wearing glovesFeatures a convenient clockInternal memory records peak readoutTachometer features adjustable sensitivity and updates every 0,3-0,6 seconds, with a range of 0-19.999 rpmTemperature gauge updates data every second, with a range display of 32-356 °F (0-180 °C)Gauge body measures 78 mm L x 40 mm W x 20 mm H