Extendable edge reference tool

Extendable level

Extendable level

Extensible carpenter's level

Extensible carpenter's level

Extensible level

Extension level

Extension level

Extension level apparatus

Extension level, square and length gauge

Extension set for spirit levels

Ferrofluid inclinometer

Ferrofluidic orientation sensor and method of forming the...

Fiber optic angular orientation sensor digital serial encoding

Fiber optic earth rotation gyro compass

Fiber optic position indicator using liquid/air light transmissi

Flange slot magnet mount for an I-beam level

Flexible level

Flexible leveling device

Float biased level apparatus