I rent my cars, I change model every three or four months, and I'm never sure tire pressure was well done. This is usually the case, as my landlord rather puts too much than not enough, but I prefer to check. For example, the car I have now, a tire had received much more air than others. With this gauge, I could empty the tire slightly (cold!) To balance it all.
The pressure storage feature front / rear is just a reminder, but it is convenient because it avoids having to constantly put his nose in the driver's door redéchiffrer to the manufacturer's recommendations. With that, I only need to do once at the beginning of the lease, and I record the values in the gauge.
The small metal slot on the back of the measuring head to help clear a cold tire overinflated, is practical. Not automatic, but it is useful to have on hand.
