Definitely check the 2 diff batteries. 1 is in the display unit and 1 is in the measuring unit on the fork. The zeroing point is marked on the bottom and you can only see it if you look through the spokes. The distance for the signal from the 2 devices isn't that far so make sure you have it close enough. Mine is set up half way on the fork and it works ok. Same goes for the magnet and the device on the fork. The instructions are kinda complicated but one thing I noticed that I overlooked was the button on the bottom of the unit, it's black and quite flat so you might have missed it and that might be used to set it up. I never had to set mine up, had the LBS do it : ).