InclinometerW
Inclinometer
AlidadeW
Alidade
ArchipendulumW
Archipendulum
AstrolabeW
Astrolabe
Bull's eye levelW
Bull's eye level
Mariner's astrolabeW
Mariner's astrolabe
Plumb bobW
Plumb bob
Reed levelW
Reed level
Spirit levelW
Spirit level
TheodoliteW
Theodolite
TiltmeterW
Tiltmeter
Topographic Abney levelW
Topographic Abney level
Water level (device)W
Water level (device)