... time display air ppllution index; 2,the air tester is test VOC, dust bacteria, stink,weat, etc; 3,display ... the calendar. 1,newest calendar desigen:display year, moth, day, time, week;2,the ... bacteria, stink,weat, etc;3,real-time display air pollution index air pollution index:0-250 ... volatile gases4, VOC(volatile organic compound): Quality display light show red will alarm, remind users ...