The Dwyer TH2-10 thermo-hygrometer pen is a compact handheld device that measures temperature, humidity, dew point, wet bulb, and heat index for heat stroke prevention. The TH2-10 has many applications including HVAC, home inspection for examining heating or cooling conditions, outdoor weather monitoring to avoid heat stroke, and construction or industrial inspection. This product offers Fahrenheit and Celsius units, data hold function, and 0.1°F/°C resolution.