The Series 500 Portable Air Quality Monitor is compatible with up to 30 different sensor heads, measuring a range of pollutants (including PM 2.5. PM 10, CO, CO 2, NO 2, VOC, O 3, SO 2, H 2 S and more.) Data is stored on board the Series 500 with a maximum 8,188 records available. To download the data a USB cable is supplied for connection to PC.