Borehole tool
Borehole tool
Box level
Bubble inclination gauge including a central shield for light-em
Bubble level
Bubble level
Builder's level with hand-grip feature
Building block laying level indicating device
C-clamps with integral bubble levels
Caddy for level vial
Calibration and compensation of an electronic compass system
Calibration apparatus for automatic magnetic compass correction
Calibration correction method for magnetic survey tools
Calibration of a meridian seeking instrument
Camber aligning tool
Cant angle sensor assembly
Cant angle sensor assembly
Cant angle sensor assembly
Cantilever-type inclinometer
Capacitive angle sensor employing a vertical cantilever beam