DC Digital Multimeter w/ Alarm Displays amperage from -500 to +500 Amps Displays voltage from 0 to 60 Volts in 0.01 Volt increments High and low voltage, audio and visual alarms Standard meter operates in negative side of circuit only. Shunt Shifter required for positive side installation such as alternators 3 levels of display brightness Programmable sleep mode blanks display for power conservation Splashproof front Includes 500 Amp shunt Applicable for 12, 24, 32, 36, and 42 Volt DC systems WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Owner&';s Manual (pdf)