That is the closest it measures down to, that is how the processor is designed, but 35cm is not much, so i think it is about right, it can measure up to about 3m away down to the 35cm in 2 cm increments, also get a beeping sound from the digital display which changes as i get closer i.e more beeps = closer. I have mounted the display on the dash tray so its easy to see, i was thinking of having the reverse beeper disconnected, but it doesnt really make a differenceas the sensor beeper is louder.
robbie.