"102156701"@en-us . . . . "Abney level"^^ . "02667693-n"^^ . . "0"^^ . "102576298"@en-us . . . "0"^^ . "Abney level"@en-us . . . . "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"@en-us . "102667693"^^ .