Weichuanglianhe 2.8" Multifunctional Portable Digital Air PM2.5/1.0/10 Haze Tester Mositure Temperature HCHO Formaldehyde Particle Meter Air Quality Index Dust Indicator Monitor Monitoring Device Sensor USB Rechargeable for Home Automobile Woodworking Shop

Air quality gets worse. Both in a visible and secret or unobservable way. We cannot improve the air quality in one day, but we can do something to protect ourselves from being poisoned by it. To start with, we should equip us with a air quality tester, so that we can precisely be informed what's outside or inside our home, then we can do something to cope with. This one,  2.8" Multifunctional Portable Digital Air PM2.5/1.0/10 Haze Formaldehyde Tester, nearly a state-of-the-art air quality monitor, is no doubt your best choice! It is also a Formaldehyde, Particle Number, Moisture and Temperature tester. One for all, truly a can-not-miss product to assist you to live a more healthy and high-quality life.

Features:
Adopting professional and high quality sensor, which makes the monitor more accurate in testing.
Multiple functions - haze (PM2.5/1.0/10) test, formaldehyde, six parameters of the particle number and temperature and humidity measurement.
Chinese air quality index, Chinese standard/American standard pollution level index, Formaldehyde pollution grade index for reference.
2.8 inch large LCD display, much more easier to read the results.
Easy operation, instant monitor when power on. (But please check the formaldehyde value 3 minutes after power on.)
Large-capacity Lithium polymer battery to work for about 4 hours consecutively.
Plug-to-use, USB powered, can be powered by cell phone or power bank (5V, 1-2A) directly via USB cable.
Power indicator light, single flash for 0~25% remaining power, double flashes for 25~50%, flashes for three times for 50~75%, flashes for four times for 75~100%, long light for full charge.
Suitable to use at home, in office, and in car etc.
Lightweight and mini, easy to carry. 

Specifications:
Sampling mode: Sucking in by fan 
Response time: Real time
Detectable particle measurement range: 0.3~10 micron
PM2.5 measurement range: 0-1000 micrograms per cubic meter
HCHO resolution: 0.01 (critical value: 0.08)
Service life: 20 thousands hours
Battery: Rechargeable Lithium polymer battery (5V 2100mAh) 
Working temperature: -20~+50℃ / -4~122℉
Working humidity: 0~99%
USB interface: Micro-USB
Item size: 82 * 61 * 50mm / 3.2 * 2.4 * 2.0in
Item weight: 350g / 12.3oz
Package weight: 220g / 7.76oz
Package size: 14.5 * 10.5 * 8.5cm / 5.7 * 4.13 * 3.3in

Note:  Please switch the power button in parallel with the screen. Do Not switch it perpendicular to the screen.

Package list:
1 *  Air PM2.5/1.0/10 Haze Formaldehyde Tester