The lab
Dropped, spun, soaked.
Three tests, every ball, no sampling. Start with the oldest one in the rulebook: let go from 1.80 m and measure how high it comes back.
Balance
True to a gram.
Spun at 600 rpm on an air bearing. Any wobble means the windings are uneven, and that ball goes back to the bench.
0rpmSpin test
± 0gBalance tolerance
Grip
Wet hands, same ball.
Misted with saline and pulled across a glass plate. The grain has to hold 90% of its dry grip — most balls manage sixty.
0%Grip retained when wet