A centimetre would be an appropriate measure.
inches
To measure the length of a baseball bat, the appropriate SI unit is meters (m), as it provides a standard measurement for longer dimensions. For the mass of a baseball, the suitable SI unit is kilograms (kg), which is typically used for measuring the mass of objects. However, grams (g) may also be used for more precise measurements of smaller items like a baseball, as it is equivalent to one-thousandth of a kilogram.
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.
Inches
cm
I would use feet
You would use meters.
centimeter
yards
You would use the SI unit meter (m) to measure the length of a DVD case.
miles or kilomiters
feet