Meters
The standard unit to measure mass is kilograms.
feet
feet
millimeter
Meters
The standard unit to measure mass is kilograms.
feet
feet
Meters
millimeter
kilograms
Kilograms are the most appropriate.
Feet
Centimeter
Litres.
The appropriate measure would depend on whether you wanted to measure its circumference, area, volume, temperature or some other attribute. For this reason, it is not possible to name an appropriate unit.
The appropriate unit to measure weight is the newton. Now, if it is really the mass you wanted, you could use kilogram or gram.