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 weightingsCosine corrected silicon diode sensor for lux levels70mm vane for airflowSemiconductor sensors in the probe for humidity and ambient temperature measurementsC or F temperature measurements55mm LCD display with backlight and function indicatorsData hold function freezes displayed valueMin memory displays lowest measured value since power onMax memory displays highest measured value since power onAuto power off after 15 minutes of no activityLow battery indicationStandard 4mm camera bush for tripod mounting2 year warrantySupplied in a briefcase carry case with lux probe, 70mm vane, humidity/temperature probe, wind muffler and battery