Electronic Tension Reader - ERT 300

ERT 300 Tennis Computer

Improve your tennis performance with the ERT 300 Tennis Computer, a precision device designed to measure the stringbed stiffness of your racquet. This compact, microprocessor-controlled tool gives players, coaches and stringers a reliable way to monitor string tension and ensure consistent performance.

Available exclusively in Australia through Tennis Warehouse Australia, the official distributor of the ERT 300 Tennis Computer.

Quick Specs

• Measures dynamic tension (DT) in the racquet stringbed
• Accuracy within 1 DT unit
• Compact, handheld, and cordless design
• Digital display for quick and clear readings
• Battery operated (replaceable battery included)
• Manufactured in Switzerland
• 3-year manufacturer’s warranty included

Key Features

• Reliable stringbed measurement: The ERT 300 provides an accurate reading of the dynamic tension, helping players understand how their racquet is performing.
• Better control and consistency: Knowing your DT value allows you to adjust string tension to suit your playing style, improving both feel and accuracy on the court.
• Portable and easy to use: Lightweight and cordless, the ERT 300 is ideal for use before or after matches, or directly after a fresh string job.
• Trusted worldwide: Used by coaches, players and professional stringers across the globe, the ERT 300 is a respected tool in racquet tuning and maintenance.

Why Buy the ERT 300

• Track tension loss over time: Strings lose tension with use. The ERT 300 helps identify the right time to restring before performance drops.
• Achieve consistent stringing: Different stringers, machines and techniques can affect string tension. This device verifies that your racquet is strung to the same standard every time.
• Prevent injuries: Playing with overly loose strings can increase shock to the arm and lead to discomfort. Measuring DT helps maintain proper stringbed stiffness for safer play.

Warranty

The ERT 300 includes a 3-year manufacturer’s warranty that covers any technical faults. Damage caused by misuse, such as dropping the device, is not covered.

Frequently Asked Questions

What does the ERT 300 measure?
It measures dynamic tension (DT), which is the stiffness of the stringbed. This is a key factor in how the racquet feels and performs.

Why is DT important?
DT affects how much control or power your racquet offers. Higher DT values typically result in better control, while lower values offer more power.

When should I restring?
If your DT drops more than 10 to 20 percent from the initial value after stringing, it's a good time to consider restringing to maintain performance.

Is the ERT 300 easy to use?
Yes. Simply place the device on the stringbed, press the button, and the DT reading appears on the digital display within seconds.

What racquets and strings are compatible?
The ERT 300 works with all tennis racquets and string types, including synthetic gut, polyester, multifilament and natural gut.

What comes in the box?
Each ERT 300 includes the device itself, a battery, a protective case, and a quick-start guide to help you get started right away.

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The ERT 300 Tennis Computer is a practical and reliable tool for any player looking to better understand and manage their equipment. With accurate measurements and easy operation, it helps take the guesswork out of racquet maintenance.