by uxcell
Buy new: $5.30
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Radius gauges require a bright light behind the object to be measured. The gauge is placed against the edge to be checked and any light leakage between the blade and edge indicates a mismatch that requires correction;It is a kind of observational measurement because of its visual test way;R15-25mm includes 16pcs at each end, radius as 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm.
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