#surveyor's_level  surveying instrument consisting basically of a small telescope with an attached spirit level rotating around a vertical axis; for measuring relative heights of land
  supertype:  surveying_instrument__surveyinginstrument__surveyor's_instrument  an instrument used by surveyors
  part:  spirit_level
  subtype:  Abney_level  a surveying instrument consisting of a spirit level and a sighting tube; used to measure the angle of inclination of a line from the observer to the target
  subtype:  Dumpy_level  a surveyor's level having a short telescope fixed to a horizontally rotating table and a spirit level

No statement uses or specializes surveyor's_level; click here to add one.