How much pressure must a foil tip apply to register a valid touch?

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1992 Olympics women's foil event — fencing Giovanna Trillini (rear) of Italy successfully defending her world champion foil title against Wang Huifeng of China at the 1992 Olympics.

In the sport of fencing, a foil tip must apply a pressure of 500 grams or more to register a valid touch. The foil is equipped with a pressure-sensitive button at its tip that, when depressed with this required force against a conductive target area (the lamé or the conductive part of the mask), completes an electrical circuit to signal a hit to the scoring apparatus.1