Description: Durable MaterialAir Quality Tester Analyzer is made of ABS plastic material, which is reliable in quality and durable in use.Please NoteBefore using Portable Air Quality Detector, you should check the meter and accessories to ensure that the meter can work properly. Do not open the tester to make changes at will. Not suitable for use or storage in high temperature and high humidity environments. Gas concentration should not exceed 20%LFL (lower flammability limit)LCD DisplayIndoor Air Quality Tester has an LCD display, the English interface is clear at a glance, simple design, easy to operateBacklight FunctionIndoor Portable Air Quality Detector comes with red and green dual color backlight function, allowing you to understand the air pollution situation.High SensitivityAir Quality Tester, high sensitivity sensor, with alarm sound function, suitable for home indoor use to protect family members, children, and the elderly Specification: Material: ABS plasticBattery: Built in 3.7v 400mAh batteryDisplay: LCD displaySampling rate: 1 secondAlarm mode: digital display, backlight, motor vibrationAutomatic shutdown time: about 5 minutesWorking temperature and humidity: 0~40'C. 0' 90%RHStorage temperature and humidity: -20~ 60'C, 0~ 75%RHWorking height: up to 2000 meters Size Chart: 17.1cmx2.8cmx2cm/6.73inchx1.10inchx0.79inch Package Includes: 1x Portable Air Quality Tester1x instruction manual1x usb Note: Please allow slightly errors due to manual measurement and different monitors.