1、It is a convenient 5-in-1 environmental meter which measures illuminance, sound level, humidity, temperature and wind speed. 2、Fast responding, pocket size design allows for one-handed operation. 3、Switchable units, m/s, km/h, ft/min, kts and MPH units can be switched at will. 4、This multi-functional meter is great for professional or home use in testing the environmental quality in a building. 5、Featuring low power consumption, automatic shutdown, low power indicator, data hold function. 6、Large LCD display for easy and clear reading, and supports back light function. Condition: 100% Brand New Item Type: Environmental Meter Material: ABS Color: As shown in the picture Sound level Applicable standard IEC61672-1 category 2 Accuracy ±2.0db Display 4 digits Resolution 0.1db Frequency response 31.5Hz〜8kHz Measurement range Automatic: 35dB〜130dB Frequency weighting db Microphone 1/2 in condenser microphone Light Measurement range 0 Lx〜200K Lx,0Fc〜20KFc Spectral response CIE photography (CIE human eye response curve) Spectral accuracy CIEVλfunctionf1’≦6％ Cosine response f2’≦2％ Accuracy ±4 ±0.5% fs of reading (<10,000Lx) ±5% ± 10 bits of reading (> 10,000 Lx) Photoelectric detector A silicon photodiode with a filter Wind speed Wind speed range 0.5m /s〜30.0m / s Wind speed accuracy ±(3％±0.3d) Measurement unit m / s,km / h,ft / min,kts,Mph Temperature Measurement range -40〜70℃(-40〜158℉) Accuracy ±2.0℃,±3.6℉ Measurement unit ℃/℉ Resolution 0.1 Humidity Measurement range 10〜95％RH Accuracy ±5RH％ Resolution 0.1 Update 1times/s Maximum value Maximum value Minimum value Minimum value Data hold Hold Auto power-off The power is automatically turned off after about 2 minutes. Idle for 15 minutes Power supply 1 x 9Vbattery,model:006P(Not included) NEDA1604 or IEC6F22 Battery life About 30 hours Operating conditions -20℃〜60℃,10％RH〜90％RH Storage conditions -40℃〜60℃,10％RH〜75％RH Size 252x66x33mm / 9.9x2.6x1.3in(L x W x H) Weight 568g/20oz 1 x Sound Level Meter(1 x Illuminometer Probe, 1 x Temperature Humidity Probe, 1 x Anemometer Probe) 1 x English Manual 1 x Box