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Umpire Cricket Ball Gauge
Ball gauge. used to check if the ball has gone out of shape. 2 joined rings to test 142g and 156g size balls.
MCC Law
4.1 Cricket Ball size
The 156g ball, when new, shall measure not less than 8.81 in/22.4 cm, nor more than 9 in/22.9 cm (7.29cm diameter) in circumference.
