Air Quality Monitor Mini PM2.5 Best Indoor CO2 Air Quality Monitors of 2022 Features : Display screen: LED digital display Power supply: rechargeable battery Battery working time: 5 hours Battery capacity: 500mAh Measuring range: 0-999ug/m³ Resolution: 1ug/m³ Mini stone design, fashion and portable PM2.5 measurement, adopt laser sensor technology Built-in lithium battery, let you measure PM2.5 value at anytime and …