Hand-held Unit Offers Accurate Solution to Remote Temperature Measurement . This thermometer is a safe and simple way to determine hidden hot and cold spots from a distance. Perfect for HVACR technicians, electricians and plumbers, the device allows its user to automatically acquire a reference temperature and determine, with its tri-colored light system and audible alarm, whether subsequent readings are above or below the set-point value. With its STAR BURST laser targeting system, the IRTC50 enables the user to approximate the size of the measured spot, resulting in a quick and accurate temperature measurement without the uncertainty of a traditional IR thermometer. Ideal for energy auditors, building inspectors, HVAC technicians, electricians, manufacturing technicians, food processing inspectors and homeowners.