Some time ago, I had placed a few meter into a temperature chamber and let them settle at -20 and 60C, noting the displayed value. The UT181A was effected the least of the meters I looked at. The UT61E was pretty poor. Later I did a video where I compensated it using a resistor and diode.
Today, I tried to repeat the test using the meat packing box and the UT181A. The first thing I found is I can't drive the temperature below -4 with the 181A inside. Even after the backlight turns off. But they have the crazy battery in there for a reason.
UT181A_0_50C.png shows the output of the UT181A (blue) captured with their software and the ambient air temperature. I started out at 0, then increased it 10 degrees every half hour.
UT181A_0_50C_1mv.png shows the zoomed in reported output. No big surprises and it basically just does the same thing it did before, hardly move. An impressive meter if it had a little help. Well it's back to the charger for it.