Dynamic difference calorimeter for determining the oxidation induction time for polymer pipe and protective pipe systems as well as moulded elements made of polyolefins. The length of time the anti-oxidant remains in the test sample and thus prevents oxidation is measured. The test sample is kept at a constant, predetermined temperature in flowing oxygen during this test. The dynamic difference calorimeter provides a large measuring range at high resolution. This quality device is characterised by high temperature accuracy and reproducibility as well as high manufacturing quality and the latest sensor technology.