USEDin fitted lined case a stainless steel caliper that jaws open 6\" . it will measure inside ,outside and depth measurments in meric and sae. it has a lockable head and a off on button,2 batteries and instructions includes. this is a good quality instrument without spending hundreds of dollars. it accuracy is .02 mm and .001sae. i have been useing one for several years. you can measure gears, clock chains . shim and round metalstock crystals or anything up to 6\"

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