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Contact Supplier"To determine the value of G. It consists of an electronic unit having for sockets & a switch to help to hold or release the ball.A heavy retort stand carries a solenoid. When toggle switch is on catch position, current flows through solenoid producing a magnetic field & holding the ball.The retort stand carries another base.The ball after being released from solenoid falls on this base.Time taken by the ball to travel from solenoid to second base is recorded in electronic unit."