EDWARDS nEXT turbomolecular pumps include nEXT55, nEXT85, nEXT240, nEXT300, nEXT400, nEXT730, nEXT930 and nEXT1230, which correspond to eight models of molecular pumps: 55 l/s, 85 l/s, 240 l/s, 300 l/s, respectively. Pumping speed of 400 l/s, 730 l/s, 930 l/s, 1230 l/s