This is a five star tool considering the low price and good functionality. I've owned this tool for a year now - and have used it many, many times (restoring vintage clocks, vintage bikes and many other projects). It's not a professional tool and it doesn't cost hundreds of dollars. But it is a very useful tool for home and amateur use. I've compared this tool to two professional calipers - I usually get accurate readings - or - 0.0005 inch +/- deviation. I especially like the large LCD. The display β works very well with my aging eyesight.
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