Ro Ammeter Voltmeter, real time monitoring battery packs of vehicles, remind you of charge or replacement in time, better avoid emergent dead battery at starting car engine Embedded in 3-bit LED digital display, Clearly shows you the current precise readings of working volts, better helps you to early notice your car voltage conditionSuper input of up to DC 60V with Over-current, Over-volt and Short Circuit Protection, protects the whole circuit, fits for 12-24V Car Motorcycle ATV UTV RV Vehicles and Marine BoatMade of - & retardant durable plastic and good conductivity pins with black surface treatment, wear and tear resistant for long lasting durabilityMeasure voltage: DC 12V-24VSize: 37x37x32mmInterface Type: Anode and cathodeLED display color: BlueApplication: Universal for all , motorcycles and other universal models.Colour:blackMaterial: PCPackage Contents:1 x Voltage ammeterOnly the above package content, other products are not included.Note: and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.