The water vapor transmission rate meter evaluates the water vapor permeability of materials through a series of precise measurement steps. Its working principle is based on the rate at which water vapor passes through materials under different humidity and pressure conditions. The main measurement parameters include: Water vapor transmission rate: indicates the amount of water vapor passing through a material per unit area per unit time. Water vapor resistance: refers to the degree of resistance of a material to water vapor transmission, and is often used to measure the breathability of a material.

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