STABNDARD as 1289.3.9.1
Test Gauge to suit :
A metal right cone of length not less than 32 mm and an included angle of 30 ±1°.
The cone shall have a smooth, unblemished, polished surface and shall be replaced
when the point can no longer be felt when brushed lightly with a fingertip when the
tip of the cone is pushed through a hole of 1.5 ±0.1 mm diameter bored through a
metal plate 1.75 ±0.1 mm thick.