They work great. You attach it to the valves and it starts measuring immediately. It's easy and the quality looks good. I borrowed pressure gauges from NAPA and they were useless. By the way, avoid NAPA auto parts. what a pile of rubbish. I haven't had high side pressure with their gauges, with this one I had it straight away. Done and I was ready to go. It also provides you with a graph based on ambient temperature so you can set the right pressure accordingly. Also the price is not to be commended. I can't really recommend these guys and Amazon. In a rural area like Yellowstone, an amazon is a lifesaver as NAPA and every other shop here is absolute crap.
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