Mini OLED DC VoltmeterMonitors DC voltage on a bright, waterproof, daylight readable OLED screenCompact size enables mounting in any convenient locationIP66 waterproofReverse polarity protectedMounts in a common 1-1/8 in holeSpecificationsMeter: VoltageNominal Voltage:12V/24V DCResolution: 0.01DCInput Voltage Range: 8-36V DCOperating Current: 15mAVoltage 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)