(5 in one professional environmental meter Features: Adaptive and highly sensitive sensor with fast response and high accuracy. Multipurpose meter measures flow speed, temperature, chill temperature, humidity, light and sound. Air velocity measuring units selectable by pressing button on the front panel for five kinds of units. Multi channel display for relative humidity and temperature measured values or air velocity and temperature measured values at the same time. Zero button design makes light meter calibration. Hold function to freeze the current reading value. USB interface. Accessories: Instruction manual, type k temperature probe, sponge cover, pouch case and battery