After a long search and a bad buy, I have decided for this pump. Compared to other air pumps in miniature, this pump is working properly. It is no frustration as with other pumps. Thanks to the integrated switch, with which you can select the print area, represents the pump also in higher pressure ranges is not a problem. Although you have to pump in the range from 40 psi often, but the effort is considerably lower than other pumps. The price is justified for this product.