The GESTER GT-KC21-1 Water Vapor Permeability Tester is a high-precision lab testing instrument engineered to evaluate the breathability and moisture vapor transmission rate (WVTR) of footwear vamp materials, upper leathers, linings, and coated fabrics. Operating in a standard conditioning room (23 ± 2℃, 50 ± 5% RH), the GT-KC21-1 simulates real-world wear conditions to ensure footwear materials allow sweat evaporation while maintaining structural integrity. Equipped with 6 testing stations and a touch-screen control system, it provides reliable, repeatable data for footwear manufacturers, R&D labs, and third-party testing institutions.