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Title: Cheap! You get what you pay for!
Review: I am pretty upset that the first person who reviewed this item is the person who convinced me to buy it. The calipers are not smooth and they don't come with a certificate of calibration, which pretty much renders these completely useless unless you are using this for your own hobby at home and don't need them to be calibrated. Do not use these if you are an engineer who needs verification that these are calibrated.
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