To test colour fastness to perspiration, specimens (fabric, yarn or fibre) in contact with Multi-fibre Adjacent Fabric, are treated in two different solutions containing histidine, one alkaline and one acidic. The Perspirometer applies a specified pressure to a package of test specimens separated by acrylic or glass plates. The spring loaded mechanism ensures that the correct pressure is maintained when the loading Weight is removed. Two loading weights are available to accommodate the requirements of the ISO and AATCC test methods. Manufactured from high grade stainless steel.