Well I'll tackle the easy part first, the compass. It's a liquid filled button compass, and typical of all button compasses it's sensitive to sticking when using on all but the flattest of angles. It does point north when given a chance to "settle down".
The thermometer offers its own set of issues. Location is everything. If you are going to use it strapped to your wrist, it will do a wonderful job of reading your skin temperature, and not the outside air temperature. It takes a couple of minutes after taking it off to adjust to the ambient air temperature. Having said all of this, it does a pretty good job, and is accurate.
I've found the best use for these is strapped to the shoulder harness of my pack. While the protective covers won't take a lot of abuse, they do a good job in relatively protected area of my pack harness.
Overall a good item that does what it was designed to do. Provide an emergency backup to your compass, and give you a good idea of what the temperature is.
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