12 in 1 Function:Temperature/Humidity/Time/CO/CO2/Curve /TVOC//PM2.5/PM10/Formaldehyde Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Directions:Main interface click to switch the temperature, double-click to turn off the sound, 3 click to enter the calibration interface (calibration interface does not support the operation, unless the power off), 4 click to enter the rest screen (rest state click to brighten the screen), 5 click to enter the curve and the formaldehyde interface (curve interface click to switch the PM2.5, formaldehyde, TVOC, formaldehyde comparison interface, (formaldehyde comparison interface according to the double-click to record the last group of data, and then double-click to record group of data) 6 click to enter the time setting interface, time settings. Enter the time setting interface, time setting interface 3 click is to choose to change, click plus 1, double-click minus 1, set the completion of the 5-click exit, or wait 5 seconds to automatically return to the main interface. 7 click to enter the temperature adjustment interface (temperature adjustment interface, click plus 1 degree, double-click minus 1 degree, 5-click exit, or five seconds of no operation to exit the interface) Color: Black Material: ABS Package Contents: 1 x 12 in 1 Air Quality Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.