2nd hint: The tube is full of fresh air, at moderate pressure;  and the man at the rear end is on alert for a slight pisssssst sound.

Who knows what does it  mean to tell us

Turkish Standards would allow a Pissst sound only up to 7.335 decibels, for first time brides-to-be.

Test results over and above this value may indicate unauthorised milage or an error in production.

Did somebody understand what is this?

A full "explanation for dummies", by deli, will follow.

I bet she has already reached the correct understanding.

I do hope I did not understand it.. If so, first guess was correct, but I thought it was such stupidity it couldnt be true At least it was headed under ´sivri zekalý´ 

Alpha, does any Turk when seeing such a picture, understand what is tested?

perhaps it´s these sort of standards that are preventing Turkey joining the EU ha ha  I´m sure the EU is at least 15 decibels

 This one is the explanation ?

Of course....Piece of cake !

I will have to check again my IQ because i didnt understand anything. Is there anybody else who understood and can explain me?

 ben boyleyim 

 dont worry yourselfits because you  dont have a warped sense of humour with a screw loose