String Tension: Racquet Meter

▶ Know exactly when to restring. Pluck a main string, hold your phone's mic close, and the app reads the vibration frequency to estimate the tension of your stringbed in kilograms or pounds.

▶ Set up a profile for each frame: head size, string type and gauge for tennis, squash or badminton. The physics of a vibrating string turns pitch into a tension figure you can compare over time.

▶ Watch the drop. Tension falls even when you are not playing, so a history graph shows how much softer your bed has gotten since the day it was fresh, like minus fifteen percent and counting.

▶ Set a threshold and get a reminder when your bed has dropped past the feel you like, so a restring is never a surprise mid match.

▶ Save several racquets, log each measurement, and share a clean result card. Works on device, no account needed.

Readings are relative estimates that depend on your frame and string, and are best used to track change over time rather than as a certified gauge. Results vary with technique and setup.