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(US), caliper
1. an instrument for measuring internal or external dimensions, consisting of two steel legs hinged together
2. Med a splint consisting of two metal rods with straps attached, for supporting or exerting tension on the leg



a device that is lowered into a bore hole on a cable to determine the diameter of the hole. Mechanical and ultrasonic calipers are used.

The most commonly used mechanical caliper consists of three or four lever feelers (probes), which are pressed against the walls of the bore hole by springs, and a rheostat whose sliding contact is connected to the feelers by means of pushrods. A change in the diameter of the borehole produces a proportional change in the resistance of the rheostat. This resistance is measured on the surface and, as a result, a curve is produced showing the change in the diameter of the borehole from the face to the mouth of the hole. Recent models are equipped with a controlled lever device that can be opened and closed repeatedly on command from the surface.

An ultrasonic caliper is a hydrolocating device with two directional electroacoustic transducers located on opposite sides of the borehole instrument. Each transducer operates alternately as an ultrasonic oscillation emitter and detector. The time interval between the moments of the transducer’s emission and its reception of the ultrasonic pulse reflected from the wall of the borehole is measured on the surface. Since the interval is proportional to the distance from the device to the borehole wall, two longitudinal profiles of the borehole are produced, characterizing its diameter.

Since the cross section of a borehole is usually noncircular, instruments have been developed that permit measurement of the size and shape of the cross section.



(design engineering)
An instrument with two legs or jaws that can be adjusted for measuring linear dimensions, thickness, or diameter.


An instrument, resembling a pair of dividers, with adjustable legs for measuring the diameter or the thickness of bodies. Also see inside caliper and outside caliper.
References in periodicals archive ?
The investment by brake caliper manufacturer Continental Teves UK Ltd will also safeguard a further 160 positions, as revealed in The Western Mail last week.
The 2014 Global and Chinese Brake Calipers Industry' is a professionally produced research report providing in depth analysis of the world wide calipers industry with a particular focus on the Chinese market.
Disk brake calipers are "pretty similar," admits Frayser.
PROBLEMS--Design and build a total workcell for the casting of aluminum brake calipers that will: provide needed flexibility, accommodate PBR's proprietary mold mounting system, provide the ability to engineer the cooler to match the production rate of the casting cell with the appropriate heat removal rate, maximize ergonomic benefits and minimize floor space requirements.
Apart from lower weight, forging technology helps reduce the cross-section of the spokes to a minimum, providing a clear, unobstructed view of the brake calipers.
Blue and emphasizing the BRZ's pure sports nature, red-finish brake calipers can be seen behind the spokes of the black painted STI wheels.
Contract award: delivery of maintenance-free bushings including accessories for brake calipers (broad br 403, 406).
The car's suspension has been tuned to suit the new-found performance and the styling has also been pumped up, with deeper front bumpers, red brake calipers, LED running lights and bespoke 18-inch alloys.
The transaction comprises the original equipment business with products such as brake calipers, disk brakes, drum brakes and parking brakes sold directly to Original Equipment Manufacturers and through various aftermarket channels.
The automaker is recalling the vehicle because some of the rear brake calipers may not have been properly machined.
Also available is Hill Start Assist, which holds fluid pressure in the brake calipers for approximately two seconds so the vehicle doesn't roll backward on steep grades when the driver switches from the brake to the throttle.