To Markandanne,
I just picked up the store brand tire pressure monitors at my local O'Reilly Automotive parts store and they have worked just fine. They had several different pressure caps, including 30, 50 and 60 psi. I have also seen them at NAPA stores. Had never heard of leaks and I haven't experienced any, but at only $2.50 or so each, I can't imagine that they're made with a great deal of quality control. I would just try them individually and throw out any that leaked.
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