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Title: Cheap-made and useless product
Review: I bought set of them in Walmart and thought I got a useful little things. Not at all, I threw them away the same day. Reason? They really bad calibrated. They supposed to work on cars with 32 psi tire pressure, and to show red when pressure going under 27 psi. So, I inflated all my tires exactly to 32 psi with electric inflator with built-in gauge, and only 1 of 4 caps showed me green color. One more was between red and green, and 2 were red, and I got them to be green only by inflating tires to 34 psi. So, you see, it's useless. I don't want to see red mark when my tires properly inflated or just a little bit underinflated. On the top of it in manual it was warning that you should replace them to usual aps before going to high-pressure car washing, and that cold emperature in the winter can affect their work. Seriously? They didn't work even in normal circumstances, not talking about winter or car wash. Don't even waste you money.
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