The Metric Conversion Act calls the metric system "the preferred system of weights and measures". Does that mean that if someone makes a thermostat, speedometer, or anything else that handles different measuring units, it must default to metric? My thermostat defaults to Fahrenheit; the thermometer I recently mentioned doesn't have a default but uses Celsius internally; and the bike computer I just bought defaults to miles but requires the wheel circumference in millimeters.
phma
