TST 507 for us with many satisfied miles and two alerts that were indeed tire-wheel issues.
Excellent customer service.
The temperature reading - Mike from TST at our last rally gave a very convincing explanation for the accuracy. Don't know one away or the other, but we use it like any other tool.
TST507. The only down side for me is my pump (Viair 450P) won't work with the flow through valves so I have to remove them to top off the tires. I should have just bought the regular monitors (not flow through).
Mike, do you know why it does not work?
Perhaps the inflator you are using?
I am getting ready to order two flow throughs for my DRW inners. They are a pain to access and the flow throughs will make it a bit easier.