YXQ R1-6.5mm Radius Gauge Pocket Measure Tool 32 Leaves Gage Replacement;

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;

R1-6.5mm includes 16pcs at each end, radius as 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm.

Useful for tool and die makers, machinists, screw machine operators and other mechanics to layout and check radii of tools, dies, etc