Went to enterprise and rented a car that had literally 4 leaking tires and they filled them all up to 55 psi before handing the car over. This photo was taken after the 30 minute drive home.
Called and took the car back in for service only to get the same car, same 55 psi on all wheels, and same major leak in the rears. Went to another enterprise location to get a normal car instead 2 days later. Really took me back to my first car, but it’s a lot less fun when it’s not even yours and the “fix” is just dangerous overpressure.
It’s true it’s not as accurate, but I think it can tell for more than 1, as long as it’s not in the wrong pattern.
Also if all 4 are going flat, there is either something seriously wrong or the user hasn’t checked tire pressure for a very long time, and you still need to do that.