Got two from Walmart.
Stuck one on my office window almost a month ago, still going strong.
Pulled the suction cup off the other for latest trip, but didn't have time to crack the shell before leaving. Plugged in battery evening before I left, put it in a snack-sized Ziploc, and off we went. Layed it on the ground or on a rock just outside my tent each evening.
Very interesting results. I felt colder on some nights that were several degrees F warmer according to the thermometer. I think the difference was a slight breeze, despite being inside TT Moment (old style).
Also kinda scary seeing how hot it gets inside HMG Windrider white cuben fiber backpack on sunny days. 94 F max reading on a day the nearest weather station says 64 F.
This thermometer will stay in my gear list.
Thanks everyone for the pointer.