High pressure compass housing
High resolution compass card position decoder
High resolution digital inclinometer
High resolution gyro system for precise angular measurement
High speed well surveying
High speed well surveying
High speed well surveying and land navigation
High speed well surveying and land navigation
Holder for a plumb bob
Horizontal evaluation datum scope
Horizontal plane viewable precision bubble level
Hose water leveling instrument
Hybrid sensor module and sensing method using the same
Hydraulic fluidic level control system
Hydrostatic level and elevation measuring device
Hydrostatic level instrument
Hydrostatic level measuring and survey apparatus
Hydrostatic plumber's level
Hydrostatic sensor device and method for measuring...
Identifying a directional reference using rate gyros...