... 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 air tester is test VOC, dust ... ,weat, etc;3,real-time display air pollution index air pollution index:0-250 0-80(green ... show red will alarm, remind users that air has reached the level of pollution, suggesting ...