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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 ?
In this research, Frost & Sullivan's expert analysts thoroughly examine the following markets: automotive brake calipers and hydraulic components.
MEASURING UP: Quality engineer Ian Penny measuring brake calipers for the new VW Touran (left) and the Golf (right) at Ebbw Vale-based Continental Teves, which has won a multi-millionpound contract to supply 600,000 calipers a year for the Touran mini MPV which will be going on sale next summer.
which remanufactures auto-parts such as transfer cases, transfer case engagement motors, fuel pumps, and brake calipers at its facility in Algona.
Benefit revision 400,000 kms central engine brakes HGE28U / 03, central carrier brakes HGE28ANL / 04 and engine brake calipers fitted HS2P20N trams CITADIS G2 Grenoble.
As well as having an extra 20bhp the 270 version gets stickier Michelin rubber, a Torsen limited slip differential, four-piston front brake calipers and 19in Carbone alloy wheels.
The vehicle offers a faster steering ratio, larger diameter front brake disc with new six-piston front brake calipers, revised springs and dampers, wider rear tires, a new stability control programme and Hill Start Assist.
Enhancements over the Leon FR models include 18-inch-alloy wheels, red brake calipers, bi-xenon headlights, racing-style front bucket seats, a lowered ride height and aluminium front suspension components.
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.
The new hot-hatch will carry the same vRS sporting badge as the turbocharged Octavia models and, like its bigger siblings, will feature lowered suspension, front and rear spoilers, alloy wheels, sports seats and special interior trim, plus Skoda's trademark racing green brake calipers.
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.