Mini OLED Temperature MeterMonitors essential electrical system parameters on a bright, waterproof, daylight readable OLED screenCompact size enables mounting in any convenient locationReverse polarity protectedMounts in a common 1-1/8″ holeConvenient temperature monitoringTemperatures range from -40C to 125C (-40F to 250F)Measures in Fahrenheit or CelsiusSpecifications:Meter: TemperatureNominal Voltage: 12V DC / 24V DCResolution: 1F or 1CAccuracy: 1.25%Operating Current: 10mAWARNING: 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)