If you mean a 'spirit level' then when the line is in the center of the bubble then the object being measured is horizontal to the ground.
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The micrometer is a precision measuring instrument, used by engineers. Each revolution of the rachet moves the spindle face 0.5mm towards the anvil face.
electric vibrator!
Ensure the surface to be tested, and the level itself, are clean so bits of swarf etc don't prop the level's end up and give false readings. Ensure the alignment of the level is true along the direction to be tested. Read the level then rotate it 180º to obviate or show any errors in the level.
Civil engineers do use jackhammers to break-up old roads and put down new ones.
what types of technology do techs use