Review on 🔧 Geartronics Digital Tire Pressure Gauge 150 PSI: Accurate and Convenient for Cars, Motorcycles, and Bikes - Backlight LCD, Non-Slip Grip - 2 Pack by Leonard Beard

These are nice gadgets. One is black, the other red. On a tire where my old pencil gauge read 18psi, the red gauge read 12.6. On black was 19.1. Obviously they must both be wrong! This is a perfect example of precision versus precision. Accuracy is the number of digits you can read. Accuracy is how close your measurement is to the standard. These things claim to have triple digit accuracy, but they're barely accurate to one digit. Something good. They are easy to hold and can be mounted very easily and leak-free on the valve stem.