They depend on the design of the instrument.
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It is not; there are more precise measurements.
Radio-Telescope measurements are the most precise
2.5cm is the most precise measurement of the two measurements.
No. A broken clock gives a very precise time, but most of the time it is wrong.
You could do it by saying that all your measurements were 10 centimetres - irrespective of what they actually were. That would be neither precise nor accurate but it sure would be consistent!