There is disclosed a semiconductor sensor for measuring the contact shear stress distribution between the socket of an above-knee prostheses and the soft tissue of an amputee’s stump. To reduce the total emissions, nitrogen oxides, especially NO and NOx, are extracted at least partially from the gas to be scrubbed, in the temperature range from 50 and 300 C. The information carrier can be a waterproof information card or an electronic information carrier, such as flash-memory device.