The NEL CCM550 Chloride Diffusion Coefficient Testing Method is a product custom-developed by Nirel based on the UHPC "Basic Properties and Test Methods of Ultra-High Performance Concrete." It boasts high measurement accuracy, with output voltage controllable within 0.03V and collected current within 0.03mA. The CCM550, designed for ease of use by existing customers, includes the method of the original CCM540 cement chloride diffusion coefficient, making it a two-method integrated unit. The product features multiple patented designs, ensuring accurate testing and durability. The intelligent vacuum saturation machine included with the product has strong sealing, requiring the vacuum pump to start only 2-3 times throughout the entire saturation process. The CCM550 can complete the test in 5 minutes, offering high efficiency.