Tire pressure monitors

[illapah]

I bought the set that screws on the valve stem. Took them off this year. I found that they were not for me. The indicator was still green when I checked the pressure and found it to be low. Another thing I don't care for is that they have to depress the valve core to read pressure (makes sense) but if not tight, the air will leak out. I had one flat tire after I installed them the next day.