The Extech EN300 Environmental Meter features a large dual LCD simultaneous display of temperature and air velocity or relative humidity. Characters reverse direction depending on mode. A built-in low friction vane wheel improves air velocity accuracy (ft/min, MPH, m/s, km/h, Knots). A precision thin-film capacitance humidity sensor provides fast response, and a thermistor measures ambient temperature.

The EN300 includes built-in humidity, light, sound, and temperature sensors, plus a vane wheel, windscreen, Type K thermocouple probe, pouch case, and six AAA batteries. Features: data hold, min/max recording, Type K input to 2372°F (1300°C), cosine and color corrected light measurement, sound level meeting IEC 61672 class 2, auto power off with disable, RS-232 PC interface, tripod mount.