The Course Measurement app records the vacuum fluctuation over an unspecified period of time. Data are recorded until the user stops the recording manually. The PT-VI divides the recording into courses. The length of the courses is specified manually in the first settings screen. The minimum, maximum and average values are calculated for each course. Event markers can be added at any time during recording. Each series of courses can be saved with an identifier and notes. Information on the markers can also be entered in the notes.