Offset, extendable, quick-release plumbness indicating apparatus
Omnidirectional angle indicator
Omnidirectional torpedo level having magnetic mounts and...
One-man field survey instrument
Open circuit leveling measuring system
Optical sensor for measuring inclination angles
Orientation sensing apparatus
Orientation sensor
Orientation sensor
Orientation sensor
Orientation sensor utilizing intra-pattern property...
Orientation sensor utilizing intra-pattern property...
Orientation sensor utilizing intra-pattern property...
Orientation-sensitive signal output
Overmolded vial for use with a level