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Resistance Voltage (both AC and DC) Current (both AC and DC)
The significance is that not everything can be expressed with whole numbers. This is especially clear in the case of measurements; a certain unit has been chosen as the standard of length (the meter); the length, width, or height of real-life objects will usually not happen to be an exact multiple of the meter (or close enough to that), so that fractions have to be used.
Kilogram per cubic meter is the one that doesn't belong. Square meter is meter^2 and cubic meter is meter^3 but kilogram per cubic meter is a density
That doesn't make sense. Square meter is 2D. Cubic meter is 3D. To attempt to answer your question... A square meter is one meter long and one meter wide. A cubic meter is one meter long, one meter wide, and one meter tall.
There are many places where one could purchase a digital multimeter. Argos, Harbor Freight Tools, and Amazon offer this item. Alternatively one could go to the local Sears store.