This product must be supplied with a ball chuck (instead of the angle chuck installed). Kugelfutter was not there. The pressure gauge does not hold air, so you must read the scale before removing the cartridge from the tire valve. There may be a good reason for that, but it makes it very difficult to use compared to other gauges I own. I tested the accuracy of this gauge on my other gauges and my professional tool. It compressed readings to a narrow 34-35psi range, while all other sensors for the same set of tires were in the 32-40psi range. I DO NOT recommend this product, the manufacturer or the person who packaged it. VERY DISAPPOINTED!