An infrared thermometer determines temperature by measuring a fraction of the thermal radiation, also known as black-body radiation, released by the object's measurement. A thermometer measures the cooling and heating temperatures from the boat's air conditioning outlets. An infrared thermometer aids various marine applications and troubleshooting stuffing box, electrical, refrigeration, and engine troubleshooting. On a running engine, an infrared thermometer locates a dead cylinder. For example, it helps check a pump bearing for overheating or an HVAC duct for proper outflow temperature and determines any temperature variation. Key Features: A bright laser beam makes it simple to aim. Response time of 500 milliseconds 0.1 degree up to 716 degree. resolution Switch from C to F Range with ease Comes with Low Battery Indicator Records the temperature minima and maxima The white backlight lights optimize visibility in the dark An automatic sleep mode after 8 seconds helps to extend battery life Specifications Brand: CDI Electronics SKU: 511-0300 UPC: 736983854865 Weight: 1.50 lbs Condition: New Manufacturer Part Number (MPN): 511-0300 Replaces Products: 667-5110300, 736983854865 Replaces: 772018 Bright laser beam provides easy targeting. 500 ms Response Time. 0.1 degree resolution up to 716 degree. Easily Switch From C to F Range. Low Battery Indicator. Min and Max Recording of temperature. White backlight illuminates the screen in the dark. Automatic sleep mode after 8 seconds extends battery life