general

Before each test, I remove the previous substance from the racket. I then put a small amount of the next substance on the racket and wipe it around with a Slurpex (PVC Super Absorbent Block Sponge). I then put it upside-down on the rack to dry for 2 minutes. It is upside-down so little to no dust settles on it.

Power test

The Power Test consists of dropping a ball vertically onto the racket from 30cm 3 times. I measure the height of the bounce. I average out the ten results to get the final power result. because the ruler is sitting vertically on the rubber, I must subtract 7.5mm from the result, as there is a 7.5mm space between the end of the ruler and the start of the markings. The height of the bounce is determined by watching a super-slow motion playback from different heights, to eliminate parallax error. The bottom of the ball is measured.
An average amount of spin is 103.5.

spin test

The spin test is measuring the height of the ball as it comes back over the net.
The ball is fired from a Table Tennis Robot (Ball Launcher) with heavy topspin. The ball is fired across the net and bounces on the table extremely close to the racket. The ball bounces off the racket and back over the net. I have a thin elastic cord that is above the net. I move this up and down until the ball consistently hits it.
The more power the racket has, the further it will bounce, therefore the higher it will come back over the net. this changes it into a second power test, making the results of this test unnecessary. However, I tested acrylic ( which has minimal effect on spin) and found a ratio of power (p) to spin (s). With no effect on spin, the spin test is 1.3 X the power test result. I divide s by p and see what that equals. The higher, the more spin was generated. Also, after the power test, I multiply p X 1.3 to see what the result would be without spin, and see how much height was gained from the spin. s - 1.3p will give the height gained by the spin.
 s - (p X 1.3)