String tension is one of the most important factors in the performance of your equipment. Even the best racquet will play poorly if not strung well. Yet it is difficult to estimate tension and monitor tension loss over time. Stringmeter eliminates the guessing, plucking & taping strings to measure tension. In minutes it gives easy readings of strung tension and tension loss. It lets you know if your racquet was strung to your preferred tension, and lets you know when its time to restring (usually 5 to 10 lbs of tension loss).