Temtop Air Quality Monitor Formaldehyde Detector PM2.5/PM10/Particles Meter HCHO/AQI Tester

* The economical 5-in-1 air quality detector use highly accurate and professional sensors to measure PM2.5, PM10, particle, HCHO and AQI. * By using our latest 3rd generation Temtop laser particle sensor and optimised PSO algorithm, it makes particle measurements become more accurate and stable and enhanced its sensor life up to 20,000 hours. * The pre-factory calibrated electrochemical sensor enhanced its accuracy and capturing formaldehyde molecules more precisely. * Large TFT screen and rich display make it clear and easy to read data, even with battery indicator light to help you check battery at any time. * Built-in high capacity Lithium-ion battery (battery voltage: 3.7VDC). 24/7 US Technician Support via Email and Phone.