Technical rubber parts need extensive measurements to ensure their technological qualities but most tests are not precise enough or not practicable under factory conditions, Viscoelasticity as the outstanding property of elastomers is highly depending on the composition of the material and the state of cure. The test device Jidoka S101 II determines the viscoelastic properties of elastomer mouldings and test pieces without destruction. With typical test times between one and two minutes this test is the base for fast and economic qualify and process control.