This page has links to tools you can use to total up PHI values extracted from your data saved from Temprecord loggers.
The data type must be temperature data only!  Do not use humidity data.
I have created a zip file named phi.zip that contains a small spreadsheet file named phi.xls and additional to this file I have also provided a basic user guide named phi_guide.pdf that explains the steps to go through in order to get a result from phi.xls.

The phi.zip file is freely available by clicking here to download the file.

To obtain a copy of Temprecord for Windows click on the software link at the top of this page that will take you to the software download page of the Temprecord website.