The high-portal measuring machine Primus GT has, compared to the Primus L, two overhead guide axes, which are furnished with a dynamic and high-precision twin drive. Separated by this weight reduction of the mass which is moved we can realise huge measuring ranges without resigning the dynamic and accuracy. The Primus GT has also, beside the Primus and Primus L, high-precision air bearing guidance and dynamic gears in all axes. The high-definition scale system in conjunction with a powerful controller complete the entire machine concept.