Features: HCHO measurement ranges 0.000 - 2.888mg/m while TVOC measurement ranges 0.000 - 9.999mg/m. High accurately test the data of HCHO and TVOC (0.001 accuracy), this professional air quality meter helps to quickly and accurately detects harmful gas in your home. Large LCD display shows the testing data in real time, you can easily get to know the air quality around to have a healthier lifestyle. Lightweight and easy to hold, you can put the air quality monitor inside your pocket or backpack then carry it with you anywhere. Powered by 2XAAbatteries, the energy saving design to allow a longer testing time and standby time. Widely used in home, car, hotel, apartment, office, outdoors and indoors. Package Includes: 1X Air Quality Monitor 1X Manual Specifications: Material: ABS Size: 133x43mm/5.23x1.69in Testing Item: HCHO TVOC Screen: LED Display Power Supply: 2 x AA Batteries (Not Included) Formaldehyde: (0.000 - 2.888mg/m) TVOC: (0.000-9.999Mg/M3) Working Voltage: 1.5V-3.2V note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.