The pH-day 2 is a portable system for recording the gastroesophageal  pH values by means of 2 channels. 

The PH-DAY 2 is a small and light unit with 2 channels.It is provided with selectable sampling rate from 1 sample per second to 1 sample every 6 seconds.The acquired data are stored into an internal memory of 256 Kbytes that ensures long duration storage.The unit houses a position sensor for automatic recording of the patient's postural changes (lying down, sitting, stand up). Two LEDs allow the reading of the pH values on-line  just pushing the proper button. The unit can work both with glass and antimony probes.