Feature: 1. Accurate Work: Comes with high accuracy up to 0.001, this air quality monitor can be used to detect formaldehyde and TVOC. 2. Clear Testing: The HCHO measuring range is 0~2.888mg/m³, and the TVOC measuring range is 0~9.999mg/m³, also has LCD screen. 3. Saving Energy: Powered by 2pcs AA battery, which is not included, ensures long time testing and stand by, very reliable. 4. Broad Utility: Allows for wide application for outdoor and indoor use, including home, car, hotel, apartment, office, etc. 5. Easy Carrying: Comes with 133 x 43 x 24mm compact size and a light weight as well, the simple carrying enables free uses. Specification: Item Type: Air Quality Monitor Battery: 2 x AA Battery (shipped without battery) Function: For formaldehyde detection, TVOC detection, quick calibration, danger alarm. Model: RC3002 Resolution: 0.001mg/m3 Measurement Method: Diffusion Acquisition Detection Principle: Principle of semiconductor gas sensor. Formaldehyde Range: 0~2.888mg/m³ TVOC Range: 0~9.999mg/m³. Package List: 1 x Air Quality Monitor