This Granville-Phillips 275 Mini-Convectron (Model: MKS # 275538-GD-T) is a high-quality unit made in the United States. It is a reliable tool for measuring vacuum pressures in a variety of industrial and scientific applications. With a unit quantity of 1, this item is perfect for those who need precision in their work. The brand name is synonymous with quality, making this a great investment for anyone in need of this type of equipment.