The Temperature Measurement app measures the temperature and displays the value as a static digit on the screen or records temperature fluctuations over an unspecified period of time. The PT-VI records data until the user stops the recording manually. The minimum, maximum and average values are calculated from the recorded data and the results saved with an identifier and notes. Subsets of the recorded data can be zoomed in to and for each subset that has been zoomed in to, the minimum, maximum and average data are recalculated and can be saved (Saved as option) with a new identifier and notes. Temperature recordings can also be retrieved from memory at a later time and saved as a subset. An event marker can also be added to mark events that occur during the recording. The event can be described in the notes for each recording or subset thereof.