The combination of Zwick’s precision-spring compression testing kit with the zwickiLine single-column testing machine and testControl electronics results in the ideal spring-testing machine. High transverse stiffness is a feature of the kit, which comes with overload protection. The ground, demagnetized compression platens have a parallel alignment accuracy of 1µm/10mm and precision guides permit only precise vertical movement. Measuring errors caused by deformation or lateral forces in the springs are reduced to a minimum thanks to the extremely stiff load cell, which is insensitive to transverse forces.