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a spirit level / bubble level on your smartphone
The level instrument is an instrument for controlling the angle and slope (horizontal, vertical, degrees.) Of a given object relative to the ground. This is now available on smartphones.
It is also called horizontal level, bubble level, bubble tube level and laser level. There are also digital levels. All carpenters use the spirit level.
It is used extensively, mainly in the field of civil engineering, construction, land surveying. This spirit level is very accurate.