VWKev please do enlighten us as to how you think it works... I know but like other posters said it doesnt do what it says on the tin afaik.
Gladly. but I don't think, I know.
If you get an immediate flat, or a blowout, the FTI wont tell you sh!t, it hasnt had time to. So for the people saying 'If your tyres are flat you'll know anyway' is true, but its not designed to tell you when your tyres are flat (as the other poster said, thats obvious) its designed to tell you if your loosing tyre pressure.
If you get a slow puncture, your FTI will calulate over a certain distance the pressure in the tyre, the wall rim size and the weight of the wheel to give you an accurate reading of the PSI. It will need time to do this, so it works very well for the job its designed to do. You will then in turn have enought ime to change the wheel or get it repaired. Thats the job its supposed to do.