The GESTER GT-D09 Perspiration Tester (Perspirometer) is a standardized laboratory test apparatus engineered to evaluate the color fastness of dyed, printed, and colored textiles against human sweat, distilled water, seawater, and saliva exposure. Constructed with high-grade 316L stainless steel, the GT-D09 resists chemical corrosion caused by acidic and alkaline artificial perspiration solutions. It features dual compliance with ISO and AATCC standards, accommodates up to 42 test specimens per run, and utilizes a spring-loaded clamping frame to maintain consistent pressure across all specimen plates during oven incubation.