The Extech EN300 5 in 1 environment tester measures humidity, temperature, air velocity, light and sound in one compact, hand-held unit. Its large dual LCD simultaneously displays temperature and air velocity or relative humidity. As the meter has sensors top and bottom the characters on display reverse direction depending on mode, hygro/thermo/anemometer or light/sound. A built-in low friction vane wheel improves the accuracy of air velocity readings. The meter has a built-in precision thin-film capacitive humidity sensor for fast response and a thermistor for ambient temperature measurements. It utilizes a precision photo diode and correction filter for cosine and colour corrected light measurements. Sound level measurement meets IEC 61672 class 2 using 'A' frequency weighting and fast response time. Supplied with with built-in humidity, light, sound and temperature sensors, vane wheel, windscreen, type-K thermocouple probe, pouch case, and 6 x 1.5V AAA batteries. * Tripod mount * RS232 interface * Auto power-off * Min/Max/Hold functions * Vane 31mm (1.2in) * Mftrs. part no. EN300 * Dimensions 248 x 70 x 34mm (9.8 x 2.8 x 1.3in) * Weight 335g (11.8oz)