... 1,real-time display air ppllution index; 2,the air tester is test VOC, dust bacteria, stink,weat, etc; ... 3,display the calendar. Sell air tester PWJ-5P1,newest calendar desigen:display year, moth, day, ... time, week;2,the air tester is test VOC, dust bacteria, stink,weat, etc;3 ... to take a breath or leave the room Our air tester bacteria, dust, stink, sweat, etc. VOC is ...