CDC guidelines list “Checking and recording minimum/maximum temperatures at start of each workday” as a recommendation for coordinators. These values are the lowest (minimum) and highest (maximum) temperatures that have occurred over a period of time.
Primex refers to this period of time as the Collection Period and is reset by a staff member from the sensor device.
For example, if you reset a sensor's collection period at 8:02 AM on a Tuesday and you look at the sensor's local display at 7:45 AM on Wednesday, the lowest sampled reading (Lo) and highest sampled reading (Hi) displayed is for the time period from 8:02 AM Tuesday to 7:45 AM on Wednesday. If you reset the collection period at 7:46 AM on Wednesday, that resets the collection period to start on Wednesday at 7:46 AM.