Does anyone here own the ERT 700? If so, would you please share your experience with it? I thought it is a really cool gadget for a stringer. It allows you to check how good a string job you had done and when to restring your racquet after it loses the tension. Below is the description of the meter directly copied from the Stringway site. Is there a similar gadget made by other brand? Thanks. The ERT 700 is a very sophisticated and accurate measuring instrument that measures the stiffness of the strings in the racquet. This tennis computer measures the Dynamic Tension or DT value. The DT value is the force required to depress the strings in the racquet one cm. The ERT 700 provides the following information: 1. It measures the DT Value. 2. It calculates the average stringing tension required to string a particular frame according to its stiffness. 3. It shows a diagram utilizing percentages to demonstrate "power" and "control" parameters. 4. Memory stores level of stiffness of a particular frame and this information can be utilized before stringing the racquet.