I immediately ordered several new tire gauges. This one is from TiGaAt and a few smaller digital ones. They were all within 1psi of each other so I trust them. My old one was damaged and actually read about 6psi too low meaning I overinflated everything so it went in the trash. I like TiGaAT very much. It's very solid. and it seems well done. It made it easier to keep the correct pressure in the tires of all my cars. It snaps right into my air hose and doesn't leak. I really like how it attaches to the valve stem. The battery life should be long since the device turns off automatically after about 30 seconds. I finally have a tire pressure sensor that mechanics use and I think you'll be as happy with it as I am. The price was great too.