The Triplett EM300 10-in-1 Environmental Meter measures Air Temperature, Humidity, Type K Temperature, Wet Bulb, Dew Point, Heat Index, Air Velocity, Air Flow, Wind Chill, and Light. Readings are displayed on the dual backlit LCD that automatically reverses when taking Light measurements. The Triplett EM300 features a concise and compact button arrangement for easy one-hand operation. The low-friction ball bearing mounted wheel design provides high accuracy and the high precision humidity sensor has a fast response time. Temperature readings are °F/°C switchable. Min/Max records highest and lowest readings. Data Hold freezes the reading on the display. Auto power off with disable conserves battery life. The built-in tripod mount can be used to free-up your hands when taking measurements over an extended amount of time.