I imagine the US will be the last country using the "English" units. There are still plenty of folks here who think it is a commie plot or something "French".
I have started using "C" for my pool temperature, mostly because the lab grade armored thermometer is marked that way. It is easier though. 27 is too cold and 31 is too hot. I am working on a floating thermometer that outputs on 4 LEDS.
27 and below blue
28 yellow
29 green
30 and above red
