The digital Multifunction Environment Meter has been designed to combine the functions of Sound Level Meter, Light Meter, Humidity Meter Temperature Meter and CFM/CMM Thermo-Anemometer (859B 5in1). It is an ideal Multifunction Environment Meter Instrument with scores of practical applications for professional and home use. ●The Sound level function can be used to measure noise in factories, schools, offi ces, home, etc, checking acoustics of studios, auditoriums and hi-fi installations. ●The Light function is used to measure luminance in the fi eld. It is fully cosine corrected for the angularincidence of light. The light sensitive component used in the meter is a very stable, long, life silicon diode. ●The Humidity/Temperature uses a humidity/semiconductor sensor and K type thermocouple. ●CFM/CMM Thermo-Anemometer is suitable for use in a wide variety of applications, including plant maintenance operations, environmental analysis, fume hood testing, and HVAC system assessment