The AET-965 5-in-1 environment meter is a cost-effective introduction to aid conformance to health & safety in the work place. It measures sound levels, light levels, airflow, %RH and temperature. The LCD display has a backlight, large digits and function indicators. Auto ranges for sound with A frequency weightings Cosine corrected silicon diode sensor for lux levels 70mm vane for airflow Semiconductor sensors in the probe for humidity and ambient temperature measurements C or F temperature measurements 55mm LCD display with backlight and function indicators Data hold function freezes displayed value Min memory displays lowest measured value since power on Max memory displays highest measured value since power on Auto power off after 15 minutes of no activity Low battery indication Standard 4mm camera bush for tripod mounting 2 year warranty Supplied in a briefcase carry case with lux probe, 70mm vane, humidity/temperature probe, wind muffler and battery