Extech 45170 Hygro-Thermo-Anemometer-Light Meter

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Pocket size rugged 4-in-1 meter for Humidity, Temperature, Air Velocity and Light
Ergonomic pocket size housing with large dual LCD simultaneous display of Temperature and Air Velocity or Relative Humidity
Characters on display reverse direction depending on Hygro-Thermo-Anemometer or Light Mode
Data Hold to freeze the displayed value
Records Min/Max readings
Built-in low friction vane wheel improves accuracy of air velocity in ft/min, MPH, m/s, km/h, and Knots
Built-in precision thin-film capacitance humidity sensor for fast response
Built in thermistor for ambient temperature measurements
High temperature measurements using Type K thermocouple
Utilizes precision photo diode and color correction filter
Cosine and color corrected light measurements
Auto power off, Low Battery and overrange indication