Tim Shoppa wrote:
On Nov 8, 10:38?pm, Ignoramus3975
wrote:
After spending half an hour in the freezer...

Fluke 97 was not functioning at all, but the Harbor Freight $3.99
multimeter continued to show function.

I think you're mostly measuring the point at which the LCD display
stops responding. Maybe if you had cranked the contrast all the way up
you could've seen it.

The Fluke 97 scopemeter is a dot-matrix LCD display and won't work
well at all below freezing. The manual says operating range stops at
0deg C.

The Harbor Freight $3.99 unit is a 7-segment type LCD display and will
do quite a bit better below freezing.

Twenty or thirty years ago the 7-segment LCD displays got awfully
SSSSLLLLOOOOOWWWWW below maybe 40F. They have improved low-temperature
over the years but the dot-matrix LCD's are still not as
environmentally versatile.

Tim.

Bingo.

it also depends on how old they are. LCD actually age with use. The
contrast starts to really drop, even for 7 segment displays.