I bought this product a few months ago so I didn't waste time going to tire shops and asking about tire pressures. And he's really done an impressive job so far! This is particularly necessary when driving on the road. One of my rear tires started to lose air while on a trip in the middle of nowhere last week. If I hadn't taken this handy device with me, I would have had to call tech support and wasted a lot of time. I also tried this on my bike and basketball, it turned out to be very good. Highly recommended!