The Blue Sea 8236-BSS DC Digital Ammeter, 500 to 500A supports accurate monitoring or measurement of an onboard electrical system.3 levels of display brightness; Applicable for 12, 24, 32, 36, and 42 V DC systems.Product Information Manufacturer Part Number 8236-BSS Key Features 3 levels of display brightness Applicable for 12, 24, 32, 36, and 42 V DC systems Displays amperage from -500 to +500 Amps Manual sleep mode blanks display for power conservation Splashproof front Standard meter operates in negative side of circuit only. Shunt Shifter required for positive side installation such as alternators IncludedIncludes 500 Amp shuntImportant InformationWARNING: 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.