centimetres or millimetres
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The answer will depend on what characteristic of the thumb you wish to measure: length, width, mass, volume, resistance to pressure, etc.The answer will depend on what characteristic of the thumb you wish to measure: length, width, mass, volume, resistance to pressure, etc.The answer will depend on what characteristic of the thumb you wish to measure: length, width, mass, volume, resistance to pressure, etc.The answer will depend on what characteristic of the thumb you wish to measure: length, width, mass, volume, resistance to pressure, etc.
The base measurement for length is a meter.
a ruler
Any metric unit would do. But it might be easier to pick something smaller than the length of the pencil, like a centimeter, or a millimeter.
The basic unit of length in the metric system is the meter. Grams are used to measure weight and liter is used to measure liquid capacity.