Liters! Hope i helpedd!
The 'foot' or the 'meter' would both do nicely.
The appropriate unit to measure weight is the newton. Now, if it is really the mass you wanted, you could use kilogram or gram.
Length would be the most appropriate unit of measurement
By unit of length and distance and conversion ,we can say that the most appropriate unit to measure the length of a finger is cm.
The appropriate unit is a metre.