Digital Fridge/Freezer Thermometer

Nice thermometer, but technical defect

Bought a digital fridge/freezer thermometer. Works well now, but there was a problem when it arrived. For no particular reason it repeatedly went blank. If I moved it around, it came back to life. After some inspection, it seemed like the battery was loose. I bent the electrical contact at the bottom of the device upwards to better contact the battery. Now it works nicely, with no problems. A minor problem, but most people would not be able to figure it out.

Not sure how to read it

I am not sure how to read the MIN/MAX temperature. We need a thermometer that tells us what the coldest low was and the coldest high that our freezers temperature range for the day/weekend