This product is designed and manufactured based on the electrolytic method principle, in accordance with standards such as GB/T 21529 and ISO 15106-3. It is used to test the Moisture Vapor Transmission Rate (WVTR) of samples under controlled temperature and humidity conditions. Ideal for testing the water vapor permeability of films, sheets, papers, packaging, and various materials in industries such as food, pharmaceuticals, medical devices, daily chemicals, and photovoltaic electronics, it serves as an essential offline or online instrument for packaging manufacturers to evaluate the barrier performance of packaging materials.