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Those valve stem cap ones are complete junk just warning you. They push down on your valve and measure the pressure that way. Issue with it is they will leak me and my buddy put 2 different brands on our cars and both either leaked out a week later or a month later. I check my tires once every 2 weeks or a month and they dont drop or do 1 psi a month. Those cap sensors it was like 1 psi every day or other day since they suck at sealing.
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