SCNTCV Features: HCHO measurement range: 0.000 - 2.888 mg/m; TVOC measurement range: 0.000 - 9.999 mg/m. Highly accurate detection of HCHO and TVOC with 0.001 mg/m resolution. This professional air quality meter quickly and accurately identifies harmful gases in indoor environments. Large LCD display provides real-time readings, allowing users to easily monitor air quality for a healthier living environment. Lightweight and compact design makes it easy to carry. The device can be conveniently stored in a pocket or backpack for portable use. Powered by 2 AA batteries (not included), the device features an energy-saving design for extended operation and standby time. Suitable for use in homes, cars, hotels, apartments, offices, and both indoor and outdoor environments. Specifications: Material: ABS Size: 133 x 43 mm (5.23 x 1.69 in) Measurement Parameters: HCHO, TVOC Display: LED Power Supply: 2 x AA Batteries (Not Included) Formaldehyde Range: 0.000 - 2.888 mg/m TVOC Range: 0.000 - 9.999 mg/m Working Voltage: 1.5V - 3.2V Note: Please allow 1-3 cm error due to manual measurement. Due to differences in monitor displays, the actual product color may vary slightly from images. Package Includes: 1 x Air Quality Monitor 1 x User Manual