If the quality of the spin measurement is too low, the app may show the speed result but no spin value. This can have several reasons and possible solutions.
Too much spin
If you put too much spin on the ball, it cannot be measured. Play a little softer to stay in range.
Wrong ball type
The spin measurement needs SPINSIGHT balls. It doesn’t work with normal balls or balls for the elite system. Sometimes balls get mixed up. Check if you are using a SPINSIGHT ball.
Camera focus not good enough
When the camera focus is not good enough, the dots on the ball are too blurry to see the spin. Run the Measurement Setup again to correct the focus.
On iPhones, the camera focus can change after a few minutes, especially if you did your Measurement Setup with a cold phone. If you notice that more and more balls are missing the spin value, then run the Measurement Setup again. Afterwards, it should stay stable.
Player moves inside the camera image
When one player is visible in the camera image, this can prevent proper ball detection. This can happen when doing short pushes over the table or when serving multiball. The closer the movement is to the net, the higher the risk.
Move further away from the net to prevent this problem. You can also switch the table sides because the camera doesn't see the table corners on the side where the camera is located.
Busy image background
When the background of the measurement is not smooth and dark, it may lead to measurement problems. Try putting a dark boundary behind the table so the measurement camera has a better background.
Light reflection on the table
When light from lamps or windows is reflected on the table, the measurement in some areas can have problems. Try to put the measurement phone on the other side of the table, move the table, or use another table.
Not enough light
In dark rooms, the measurement of serves may work well, but fast topspin balls can have problems. If possible, turn on more light.
Too much light
In very bright rooms and direct sunlight, the measurement of serves may work well, but fast topspin balls can have problems. If possible, avoid direct sunlight.
Uneven light
If you use additional light sources that illuminate only parts of the table, or light sources that have an uneven pattern, the measurement of fast balls can have problems. If possible, try to get smooth illumination.
Flickering light
If the room is illuminated with flickering fluorescent tubes or flickering LEDs, the measurement can have problems.