Temtop Handheld Air Quality Monitor for CO2, PM2.5, PM10, with Audio Alarm, Temp & Humidity Insights, Data Export, M2000C 2ND Formaldehyde displays HH

displays HH

above the lower value and 99% above the upper value

but also detects air quality

and industrial workshops

Temtop M2000C 2nd CO2 Meter with Zero Calibration Function PM2

Temtop Handheld Air Quality Monitor for CO2, PM2.5, PM10, with Audio Alarm, Temp & Humidity Insights, Data Export, M2000C 2ND Formaldehyde displays HHTemtop M2000C 2nd CO2 Meter with Zero Calibration Function PM2. 5 PM10 and Export data Multifunctional CO2 Monitor 8 in 1 air quality monitor measures PM2. 5, PM10, number of particles, CO2 concentration, temperature and humidity. Equipped with histogram and data export function. Advanced Built in Sensors This product is fast responding and sensitive. It uses a American Temtop PM sensor, a Swedish SenseAir CO2 sensor and a Swiss Sensirion Temperature