What are the two instruments used to measure the diameter and length of a thin wire approximately 50cm long
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A screw gauge is a precision instrument. It is used for measuring diameter of circular objects mostly wires, with an accuracy of 0.001 cm. It consists of a hollow cylinder mounted on a U frame. The hollow cylinder leads to a ratchet which is meant for fine adjustment. The U frame consists of a flat end known as stud and a screw on the other side. This screw can be moved inside the nut by fitted in the U frame by rotating the hollow cylinder called the thimble. This is called the main scale. The hollow cylinder or the thimble is graduated into 50 or 100 equal parts. This is called the circular scale.
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