All measurements require a unit to define the precision of the measurement. The preferred unit depends on the magnitude of the measured variable. For example in the customary system, commonly used in the United States, when the distance is large the mile is the preferred unit. When the distance is very small the unit of measure could be in decimal inches (0.01 in) or fractions of an inch (3/64 in). The units of measure can be divided into several categories. The common categories used in agriculture are:

1. Distance 6. Pressure

3. Temperature 8. Velocity

4. Volume 9. Torque

5. Weight or Force 10. Power.

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