Im talking about electronic devices, which may be handheld or similar, so nothing exposed to "artificial" temperature (welding, soldering, cooling with liquid gas). Devices designed to be operated by ("unprotected") humans, indoors or outdoors, such is the temperature range.
My question is: What are the especially temperature sensitive parts? I guess Im interested in the lower end (0°C and below). Are the batteries sensitive? What is also likey to fail when it gets too cold? - Which in turn also mean: which part must be kept warm if one has to attempt to operate such device in too cold a enviroment?
Example: I have recently bought a laser distance meassure, a UNI-T UT391A+. The specified operating temperature range: 0°C to 40°C. Many similar devices (even the UT391A, without +) specify -10°C or lower as their lowest. Why is that? The most obvious difference between UT391A+ and others is that the former has integrated bubble levels. Could that be what bumps the temperature tolerance by 10°?