Feature: 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. Specification: 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 . Package List: 1 x Sound Level Meter(1 x Illuminometer Probe, 1 x Temperature Humidity Probe, 1 x Anemometer Probe)1 x English Manual1 x Box Note: 1. Please allow 1-2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.