One!

Although the AIR-INSITE Base station is designed to store up to 25 audit configurations at any time, the AIR-INSITE Base station is not intended to be a mass data storage device! Once a completed audit has been transferred from AIR-INSITE data loggers to the AIR-INSITE Base station, users are encouraged to immediately transfer data from the AIR-INSITE base station to the AIR-INSITE  server.