Extech Environmental Meter Model EN300, This rugged 5-in-1 Environmental Meter measures Humidity, Temperature, Air Velocity, Light and Sound. Features include: a large dual LCD for simultaneously displaying Temperature and Air Velocity or Relative Humidity; Data Hold and Min/Max functions; a built-in low friction vane wheel which improves accuracy of air velocity, precision thin-film capacitance humidity sensor for fast response, and thermistor for ambient temperature measurements; characters on display reverse direction depending on Hygro-Thermo-Anemometer or Light-Sound Mode; utilizes precision photo diode and correction filter for Cosine and color corrected light measurements; auto power off 10 minutes after last key is pressed with disable feature; Low Battery and overrange indication; tripod mount; and PC interface with optional Data Acquisition Software 407001. Type K input measures temperature up to 2372°F (1300°C). Sound Level measurement meets IEC 61672 class 2 using A frequency weighting and fast response time. Comes complete with built-in sensors, Vane wheel, windscreen, Type K thermocouple probe, pouch case, and six 1.5V AAA batteries.