To measure the diameter of a round object as well as a tape measure or folding rule you used to need a good measure of skill or a good knowledge of mathematics But not any more because with this folding rule you can simply read off the diameter from a special scale on the reverse This ingeniously simple idea has won several inventor awards for KNAKKE It also makes this unique tool the perfect promotional gift Patented solution on the reverse Patented scale in inches and centimetres on the reverse for objects up to 33 cm in diameter patent holder Knakke NOTE Available from stock minimum order 200 Creative example The calliper the measuring tool for round objects

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