PR1 Single Perspiration Test Unit to determine colour fastness to water and perspiration in textiles. A stainless steel frame with a capacity of 20 samples of 10cm x 4 cm held between acrylic separator plates, loading weights not included. An electric incubator is required. PR2 Weight 3.36 kg (8lb ) for AATCC Tests. PR3 Additional weight 0.47 kg (1 lb) for ISO Tests.