PLAYING CONDITIONS.
5.5 It is important for the umpire or assistant umpire to check both the height of the net
and the tension of the net-cord. This should be done prior to every match, including
team matches within a team competition. It is not really satisfactory just to estimate
the tension by finger touch and several manufacturers have produced weighted net gauges,
which ensure consistency. These gauges, which weigh exactly 100g, have two notches,
one at 15.25cm and the other 14.25cm. The weighted gauge should only be
used to check the tension – it is not advisable to use it for checking the height.
After the height has been checked using a plastic net gauge, the "weighted" gauge is rested
on the top of the net, in the centre, and the tension adjusted until the bottom of the gauge
just touches the playing surface. If necessary, quickly recheck the height at each end after
the tension has been adjusted. Do not use the plastic gauge and "weighted" gauge at the same time.
Also when checking the net it is important to ensure that the clamp is attached as close as possible to the table.
Ensure that there is no cord hanging down from the net post which could affect the ball or distract the players.