| 1. | This includes aneroid barometer or preferably with a levelling instrument mounted on a tripod.
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| 2. | Levelling instruments again are used to obtain geopotential differences between points on the Earth's surface.
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| 3. | Common levelling instruments include the spirit level, the dumpy level, the digital level, and the laser level.
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| 4. | "' Levelling "'is the measurement of geodetic height using an optical levelling instrument and a level staff or rod having a numbered scale.
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