Precision Engineers can be contacted by telephone at 251-443-8844, by fax at 251-443-8843, or by regular mail at 5550 Commerce Blvd. East, Mobile, AL 36619.

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.

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.

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.

A "depth gauge micrometer" is used by engineers. A depth gauge micrometer is a precision instrument used to measure various depths of different items.