The Extech HD500 Psychrometer with Infrared (IR) and Type K Thermometers and Humidity Meter, -58 to 932°F, 30:1 combines 3 in 1 with humidity meter, type K thermometer and infrared thermometer functions. The Extech HD500 features a large triple LCD backlit display, built in USB port, minimum/maximum, data hold and auto power off functions. It has a built-in InfraRed Thermometer for non-contact temperature measurement to 932°F (500°C).