1733200 Mini OLED Voltmeter - BlueMonitors DC voltage on a bright, waterproof, daylight readable OLED screen. Features:. Reverse polarity protectedMounts in a common 1-1/8" (29mm) hole. Color: Blue. Meter: Voltage. Nominal Voltage: 12V DC/24V DC. Resolution: 0.1 DC. Cut Out Dimensions: 1-1/8" (28.58 mm). Input Voltage Range: 8V-36V DC. Operating Current: 15mA. Switching Cycles: 10,000. Weight: 0.20lb (0.09 kg). 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.