calipers
US /ˈkæl.ə.pɚz/
UK /ˈkæl.ə.pɚz/
1.
an instrument consisting of two hinged legs, for measuring external or internal dimensions
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He used calipers to measure the thickness of the metal sheet.
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The engineer carefully adjusted the calipers before taking the measurement.
2.
a device for gripping the wheel or disc in a disc brake or the drum in a drum brake to slow or stop a vehicle
:
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The mechanic replaced the worn-out brake calipers on the car.
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Regular inspection of brake calipers is essential for vehicle safety.