In the analog model, it is difficult to accurately calculate the level.
For example, the psi are in increments of 5, so you have to guess to achieve 33 or 32, for instance.

I had ordered the model with the digital display. Since they didn't have it in the store where I had already paid for it, they sent me this one. Unfortunately, it doesn't do what the other model does, even though it looks almost the same visually. The valve doesn't attach to the hose at all, and when it did attach, it got stuck and wouldn't come off. The needle showed as if it was crazy, with one end fully inflated and the other end empty, and unfortunately, it only pumped air for less than 30 seconds. After that, it never worked again, only the flashlight turned on. I returned it and got another one from a different company