I've been using Tourna Stringmeter for a while. As soon as I finish stringing a racquet, I use it to get an idea how tight the stringbed is. I never expect the resulting tension match the reference one, and they don't. Most of the time, the resulting tension is about 10 lbs higher. As the number of hours grows, I use it to check "tension loss". Sometimes we agree with each other, sometimes the meter shows the tension loss was at 10%, I would cut it and restring anyway. Above is how I rely on this apparatus. What would the ERT-300 be different? At this point my primary concern is when I should restring my racquet. Tourna Stringmeter helps, but I have doubts once in a while (just like what I described above). Any insight?