DASQUA’s Digital Infrared Thermometer measures the temperature of surfaces from a distance. It can measure temperature in boh Celsius and Fahrenheit. It is mainly for measuring temperature in heating, ventilation, and air-conditioning applications, including refrigeration and heating systems, supply and return registers, circuit breaker panels, motors and bearings, transformers, and ducts.
D : S= 8 : 1, means the Distance to the Spot Size of the unit is 8 : 1. As the Distance(D) from the target surface increases, the spot size of the area measured(S) by the unit becomes larger. So in order to get more accurate temperature, please pay attention to the Distance to Spot Size, or it will get some error if you neglect this.
IR thermometer collects the infrared radiation energy from surface of the stuff that is focused by red laser, and transfer this information into electric signal via photodetector, then analyze and calculate its temperature. So please keep in mind that what you get is the surface temperature not inside temperature.
1 x Digital Infrared Thermometer
1 x User Manual