Most of the time, I find my meter (not a Codefree) has been pretty rugged. However, last winter, I nearly threw it in the bin in disgust.
I had been out mostly walking for about half a day on one of those days when you multiple layers of gloves (at least I do ... it may have something to do with Raynaud's but please don't let that ruin the image I am trying to paint
) with the wind battering my along the street. Apart from popping into a cafe for a warming hot chocolate (medicinal ... for the Raynaud's, of course), my diabetes kit and I had been outside in the elements for a few hours.
As I was returning home, I thought I could feel a hypo coming on so, after removing my many layers, and getting enough blood to flow to my fingertips, I inserted the strip into my meter. Alas, the meter decreed "ERROR". I tried again and was met with the same response. My meter was broken and I was feeling the same way. A couple of dextrose got me up the hill but the meter needed more.
Thankfully, I have a spare meter which takes the same test strips. The spare, gobbled up a test strip with glee. No complaint. It sucked up my blood and gave me a reading to tell me I would live to fight another day. But I was less convinced by my primary meter.
It being late on a Saturday evening, I could not call the manufacturers to berate them so I resorted to the next best thing - Google. There I learnt my meter is a sensitive soul: just like my fingers, it has a minimum temperature below which it will refuse to work. As it was warmed by the central heating, it came back to life and has been a happy meter ever since.
The moral of this tale is to be aware there is a lower temperature limit as well as the upper limit you have been discussing.