Mini OLED DC VoltmeterMonitors DC voltage on a bright, waterproof, daylight readable OLED screen Compact size enables mounting in any convenient location IP66 waterproof Reverse polarity protected Mounts in a common 1-1/8 in hole Specifications Meter: Voltage Nominal Voltage:12V/24V DC Resolution: 0.01DC Input Voltage Range: 8-36V DC Operating Current: 15mA Voltage Accuracy: 1.0% 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. Quick Guide (pdf)