
This is the Accutire MS-4021B tire gauge. I've had one for a couple of years, and it's great. I've given a couple as presents, and gotten positive feedback. Accutire makes several other gauges, but I like this one because it doesn't have all that programmable junk that I don't need, and you can replace the batteries.
I got mine at Target for $12.99, but
Amazon has it for $8.99. The Amazon comments are interesting. People actually gave it a one-star rating because they didn't remove the sticker that says 28.5, and thought that was the actual reading. Always read the directions.
Another reviewer thought it didn't work because they got 0.0 every time, and didn't realize that they were getting the calibration reading. That reminds me: one of the reasons I really like this gauge is that it can be calibrated. I've thrown away too many gauges because they lost their accuracy.
Being a race fan has made me realize the importance of tire pressure. My cars have gotten much better performance and mileage ever since I started checking the pressure regularly. I typically use the air pumps at Shell stations, because they're free.