Beers ERT 300 Tennis Computer, Black

....and those who desire to play with the best condition equipment. These are not easy to come by, as they seem to sell out before you get a chance to grab one. I got mine and I won't let it go. What does it do? Well strings are like the cardio system of a tennis racquet. If the strings are not fresh, they don't snap back, and therefore they don't create the spin they did when fresh. This happens at differing times depending on the player, the amount of power they hit with, the racquet head size and flexibility, and the string pattern. Most regular players will see about 20-30 hours of play before the racquet becomes less playable, and given the next 10 or so hours the racquet is not playing to spec and the player will find their shots going long (not getting enough spin to create the downward force of the ball) or their kick serve not kicking up as it normally does. They start losing control, and most people will actually assume the problem is their own, and they begin to change their game/strokes, etc to accomodate what is actually happening with the racquet. This device the Beers ERT-300 helps you recognize your tension level, and monitor it as you lose tension. When the racquet gets to that 20%+ lost tension mark - you will find the racquet plays different. When it's at 25-30%, it is what the tennis stringing community calls "Bagged Out" and within a few hours after that (if you hit the ball with any amount of power) the string will have no more elasticity and it will break. So about 10-20 hours after the racquet stopped playing at optimal levels, most players will not make the change to fresh strings as they should, instead they play till the string breaks, all the while frustrated with how poorly they played this entire last week. Love this product, friends, customers, other players ask to have their tension checked. Works like a charm, it's my secret weapon! LOL

It simply doesn't work 9 out of 10 attempts. Either fails to start a measurement or comes back with bogus values. For a tool this pricey it is a complete disappointment.

We have used this in our tennis shop for over 2 years now and find it's information and reliablility to be outstanding. The data is invaluable if you are trying to determine when your stringbed has diminished to the point of needing a new string job. All in our stringing team are MRT's and spend time educating our customers on the use of the ERT 300. Many of the professional players that come through the Phoenix area have their own ERT 300's to check their racquets and the new stringing jobs done by our stringers at TENNIS CABANA in Sun City, AZ.

This item is ok. You have to take the reading the device gives you and then use a little handheld chart with a wheel to figure out the tension, its a pain. Main gripe is that with polys and the low tension they are strung at, after a few hitting sessions, this computer can't read the tension, its below its lowest range - not good after spending this kind of money.

It doesn't work . It gives you a different reading every time. And on some racquets it doesn't work at all