The NELD-CCM540 chloride ion diffusion coefficient tester developed by Beijing Naideli Co., Ltd. features multiple patented designs, ensuring accurate testing, ease of use, and durability, specifically designed for measuring the chloride ion diffusion coefficient in cement. It meets the requirements of the "Marine Silicate Cement" standard. The vacuum saturation machine included with the product has strong sealing, and the entire vacuum saturation process requires the vacuum pump to start only 2-3 times. The NELD-CCM540 can rapidly determine the chloride ion diffusion coefficient of cement within 10 minutes.