Hello BHBH and I have entered into a partnership on a racquet diagnostic machine. We bought an exact version of the Gamma Racquet Test Center and the Prince Precision Tuning Center. We acquired this device directly from the factory that produces the Gamma and Prince version. I have a good friend in the stringing industry that made it all possible. Our machine performs the same functions as the Gamma and Prince models. It measures swing weight, static weight (to 0.5g) and balance. The manual for the Gamma machine worked well for calibrating our machine. Our machine came with no manual nor 110v cord (it came with a 220v cord)! I used an extra PC cord that was identical. Swingweight A calibration bar comes with the machine. You can move the weight to 300, 200, or 100. I used 300 seeing that was closest to most tennis rackets. The calibration is a simple trial and error with a small screw adjustment on the back of the machine. Also there is a level bubble in the holding mechanism of the racquet. You can adjust the level by adjusting the feet of the machine. To measure the swingweight is quite easy - simply mount the racquet perpendicular, hold to the left until the machine beeps and the machine will beep again when finished with the display on the screen. This was onviously quite easy. I take 5 readings per racquet and record the most frequent reading. I have not seen a reading more than a variance of 2 units. I am also taking unstrung specifications for matching and customization purposes. This will allow me to place lead under bumpers and grommets as needed. Static Weight The scale is very easy to use, There are 2 support arms and a more than adequate table. The scale readings for the static weight are displayed on the screen below the swing weight reading. This is convenient to record both specifications per racquet when working on multiple racquets at one time. Balance The balance can be read in cm or inches. The balance bar is metal which tends to have less friction and not make the balance measurements as easy as the other two. The Gamma manual says to take the measurement when the butt of the racquet goes off the device. It is virtually impossible to balance the racquet exactly. Once again I take 3-5 measurements to insure accuracy. Overall I am very pleased with the machine that BHBH and I have purchased. It meets our goals, needs and expectations. We look forward to matching our own rackets as well as the local university men's and women's teams where BHBH lives. I am more than happy to answer any specific questions.