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Appts. for thermogravimetric characterisation of the corrosion resistance of materials includes a commercial micro balance (21) to record mass change readings at temps. > 1500 deg C. The influence of a reading distortion due to corrosive attack on the sample support and the weighing rod can be eliminated by a two stage weighing. The sample (4) can be lifted off of the interchangeable weighing rod (5) by a lifting mechanism (18), so that on the one hand the rod can be weighed with and on the other hand without the sample. After subtraction of the readings, the actual sample wt. can be recorded.