The ergonomics are superior to anything I've used in the past. This includes digital and regular pencil shapes. The large dial that stores readings is impressive, along with the glow-in-the-dark digits. The specs say it's calibrated so I trust the marketing statement. On first use my tires had 4 different readings plus or minus 6psi. After getting used to this unit I can feel the difference in handling and after a few days the tires are still psi. Feels solid and we will build. I hope it lasts longer than my previous sensors.