immediate impression is not very good. The quality of this Longacre gauge doesn't seem to be any better than a Joe's Racing digital gauge that is almost half the price. The rubber lug housing of this gauge is incredibly loose. In fact, they stuffed a piece of black styrofoam behind the display to make room. When you hold the gauge head, the rubber case moves so much that there is a large gap between the rubber and the gauge inside. The sensor itself is cheap plastic, with cheap foil buttons on the front, using Chinese batteries. In fact almost identical to Joe's half price product. The angle chuck is also identical to Joe's product. I don't know if this Longacre gauge is more accurate given the cost (both Joe's and Longacre are within 1psi of each other) but first impressions of quality pens on this gauge are $50 max. There is no calibration information on the packaging.