Original: In order for the scoring apparatus to register a hit, it must arrive with a force of at least 7.35 newtons (750 grams-force) (a higher threshold than the foil's 4.9 newtons), and the push-button must remain fully depressed for 1 millisecond.
Simplified: To score a hit, the push-button on the end of the weapon must remain fully down for 2-10 milliseconds, and must arrive (hit) with a force of at least 7.35 newtons.