Spirit level
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A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal or vertical. It is called a "spirit level" because the liquid inside its vial is
A tubular spirit level
A bull's eye spirit level mounted in a camera tripod
Machinist's precision level
Level adjustment
Inclinometer
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An inclinometer or clinometer is an instrument used for measuring angles of slope, elevation, or depression of an object with respect to gravity's direction. It is also known as a tilt indicator, tilt
Spirit level
…Electronic level Inclinometer Slip or skid indicator…
Drawing of an inclinometer, Museo Galileo, Florence
Measuring a building's height
Blériot Monoplane Inclinometer
Nautical wall inclinometer