Kenko 66 Air Gauge

Kenko Air Gauge 66 is a sizing gauge for soft tennis balls. It checks whether an inflated ball has the regulation diameter of 66 mm with a tolerance of 1 mm, which is what the rules require of an approved ball. The manufacturer describes it as an aid for setting ball pressure with the Kenko pump. It is made of polycarbonate. It is useful for a coach and at a club where a whole basket of balls has to be inflated evenly before a match. Experienced players check pressure by squeezing the ball in their hand; for beginners the gauge gives a fixed reference. Made in Japan. Supplied through the official Nagase Kenko distribution.