WVTR Water Vapor Transmission Rate Test Chamber for fabrics/textile/membrane materials as per ASTM E96 WVTR Water Vapor Transmission Rate Test Chamber for fabrics/membrane materials as per ASTM E96 Product Specifications Attribute Value Temperature control Accuracy 18 ~ 50℃±0.5℃ Temperature resolution ±0.1℃ Adjustable relative humidity 40 ~ 95%RH; ±2%RH Air flow 0.1 ~ 0.8m/s Speed 1 ~ 15r/min The number of cups 8 ASTM standard for single layer Machine size 750×720×1400mm