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Unit-Ring is a surveying instrument that brings higher usability. Just put it on fingers and measure the distance between two rings. Unit-Ring can be used in several situations below: Turn roughly size into definite data without using laborious tool, (e.g. custom-made item in an interior design project) measure long distance while take rings off, etc. Both ruler and tape-measure could be replaced by Unit-Ring. It has the added advantage of being tiny and easy to carry.
Wei Wei Chang