If i'm measuring some thing i just use what lines up on the tape, so it can be 23 3/8" by 320mm...
Can't understand Fahrenheit, so is C for me, but this goes with Bar on gauges which i only half get by converting it into PSI in my head...
I weigh refrigerant in kilos
Milk tanks are in Gallons if old icebank type and Litres if DX or new icebank enclosed type, a 2200L icebank tank make no sense...

All we need now is metric volts, amps and ohms and we can all get really confused