Added this to my autocross essentials today (with rush shipping so that I may try it tomorrow at a competition). I’ve been using a stick-type pressure gauge, hoping this will be easier and more accurate.
I’m not planning to hook it to a compressor, but thought they trigger style pressure release would be good, since that is what I usually need to do between runs.
The instructions are amusing translation of Chinese into English. Hopefully it holds up, but it was pretty cheap.