Get The Most Out of Your Game with Real Time Tension Tracking
Real Time Tension (RTT) provides a high-precision measurement of string tension. For professional and high-level players, accurate tension readings are essential for verifying string jobs and knowing when to switch rackets.
For recreational players, restringing decisions are often more subjective. Tension typically drops about 10% within the first few days after stringing, then levels off. You can monitor the continued tension drop to decide when to restring—or simply rely on the String Condition indicator for an easier reference.
Tension & Calibration
Real Time Tension (RTT) measures string tension by analyzing string vibration when you hit a ball. Unlike Static Tension (the tension set during stringing), RTT accounts for string stiffness, providing a more accurate reflection of actual playing tension.
On a freshly strung racket with 16-gauge string—the most common thickness—RTT and Static Tension are usually very close.
However, for players who want an exact match, or for those using different string gauges, we offer a calibration tool. To calibrate, insert the tool and rotate the dial until the display matches the strung tension. The best time to do this is immediately after restringing. Keep in mind that tension can vary slightly between stringers, even at the same setting. We recommend calibrating once with your preferred stringer. Recalibration is only necessary when switching string types.
Injury Prevention
Tennis elbow is caused by inflammation or small tears in the tendons that connect the forearm muscles to the outside of the elbow. This injury results from overuse—typically repeating the same arm motions, like those in tennis—leading to pain and tenderness on the outer elbow.
One often overlooked contributor to tennis elbow is old or worn-out strings. As strings lose tension and elasticity, they increase the vibration transferred to the arm and can negatively affect stroke technique. This added stress raises the risk of injury over time.
Maintaining healthy string tension and regularly replacing strings is a key preventative step. It not only helps protect your arm but also supports proper technique and extends the longevity of both your physical health and your tennis performance.