Description Features: 1. Professional testing (full function) : Formaldehyde detection / temperature detection / humidity detection / air quality detection / 3 inch color screen / USB power / alarm (over standard) / silent mode / imported sensor / high precision 2.Color LCD display, the readings are clearly displayed, and the test results are clear at a glance. 3.Formaldehyde, HCHO and TVOC super alarm, and timely alarm. 4.USB rechargeable design is easy to use and can extend the life. 5.Desktop sitting design for easy placement and convenient full day monitoring. Specifications: Test items: formaldehyde in air, ambient temperature and humidity Measurement range: Formaldehyde 0.00~3.00mg/m3, Temperature -10~60degC; Humidity 20-99% Resolution: formaldehyde 0.01mg/m3, temperature 0.1degC; humidity 1%RH Measurement accuracy: formaldehyde 5%, temperature 1 degC, humidity 5% Overload display: OL Detection principle: electrochemical sensor principle Display mode: large screen color LCD display Sampling method: diffusive collection Power supply: USB Battery Charging(battery not included) Operating temperature: -10~45 degC Operating humidity: 10~75%RH Storage temperature: -10~60 degC Storage humidity: 10~70%RH Overall dimensions: approx.138 (length) 95 (width) 58 (height) mm Weight: about 368gincludes:1 x Formaldehyde Detector 1 x USB Cable 1 x User Manual