This didn't come with instructions, but then I realized it was pretty obvious. You push the wider pin on top until the gauge reads zero. Then the thinner pin on the bottom is sticking out pretty far. You just place that thinner bar in the groove of the tire and push down until the flat part of the gauge hits the tire tread. Easy peasy. I found out my tires were still in the green so good for another winter season. This way if the tire place tries to tell me they are no good, I'll know they are scamming me. There is no battery or anything to go wrong on this, it is just a mechanical gauge that seems sturdy.
Rating: [5 of 5 Stars!]