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A physicist measuring the force of gravity may use a simple balance, one arm of which is acted on by a small mass, and the other arm is acted on by a spring.

This is the simplest type of gravimeter, and changes in the degree of balance is proportional to the local gravity.

In my country New Zealand, the force of gravity varies by approx 1 part in 1000. This is right at the legal limit for accuracy of measurement for trade purposes, so local variations in gravity are not unimportant.

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Q: What scientist would use a spring scale?
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