*4 in 1 professional measuring instrument: Anemometer, Hygrometer, Themometer, and Light meter. *Tiny bone shape with lightweight and small size case design are suitable for handling with one hand. *Wristlet design provides extra protection to the instrument especially for user one and operation. *Low-friction ball bearing mounted wheel design provides high accuracy at high and low air velocity. *Exclusive photo diode and color correction filter light sensor, spectrum meets C.I.E. photopic. *High precision humidity sensor with fast response time. *Standard type K (NiCr-NIAI) thermocouple input jack suitable for all kinds of type K probe. *Built-in microprocessor circuit assures excellent performance and accuracy. *Concise and compact buttons arrangement, easy operation. *Memorize the maximum and minimum value with recall. *C/T detection by pressing button on the front panel. *Lux/Feet-candle selection by pressing button on the front panel. *Air velocity measuring units selection 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.                                        Technical Parameters                                                           Display                                                    8 mm LCD display                                                                Measurement                                                    Anemometer, Humidity, Temperature.