I took a chance on a Aliexpress clone. Four sensors for, I don't know, under twenty bucks. But I was more interested in learning about how the sensors communicate back to the base station...
Anyway, it was not accurate - but it was consistently inaccurate. All of the sensors were 1 to 3 pounds off. It didn't vary - RF was always a pound, LF was always three. The temps were similar. Off but consistently off.
For fun I tossed the sensors on the RV only to see that they seemed to have a max pressure of about 60psi!
Oh well, it was educational.