The Extech EN300 is a rugged, multifunction environmental meter that measures Air Velocity, Relative Humidity, Ambient & Type K Temperature, Light Level, and Sound Level (35–130 dB). Designed for HVAC, industrial hygiene, and environmental assessments, it features a low-friction vane, precision photo diode with cosine correction, thin-film humidity sensor, and IEC 61672 Class 2-compliant sound meter. Includes Type K probe, windscreen, tripod mount, and PC software interface for comprehensive field analysis.