Hypsometer
A hypsometer is an instrument for measuring height or elevation. Two different principles may be used: trigonometry and atmospheric pressure.
A hypsometer is an instrument for measuring height or elevation. Two different principles may be used: trigonometry and atmospheric pressure.
A hypsometer is an instrument for measuring height or elevation. Two different principles may be used: trigonometry and atmospheric pressure.
Source: Wikipedia "Hypsometer" · CC BY-SA 4.0
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