I have an older NAPA pencil meter that has worked great for over 10 years. It was just awkward to use and hard to read, but that's for sure. Jayco Elite Pro worked once. Jayco will deflate the tire when you try to check the pressure and the needle won't snap, giving you an accurate reading. Damn Jaco! I tried calling support and they said they would call back within a day or two. I have better things to do than sit and wait for the phone to ring. I thought it must be CUSTOMER SERVICE? Very rude and unprofessional when not putting the customer first. The big problem with a lifetime warranty is if you don't get service. Garbage and I bought two of these. VERY DISAPPOINTED!