Great idea. Must be placed in the exact position on the valve stem or it will leak. I like it so far. It is very pleasant to watch while reading. However, it shows a different pressure on the gauge when inflated, but the correct reading when you release it. I'm not sure why he does that though. ANY IDEAS, HANSBRO? UPDATE 20-04-2019 / NO RESPONSE FROM COMPANY TODAY! THE PRODUCT IS DEFECTIVE IN MORE THAN ONE AREAS! BUYER BEWARE!