... concrete mixture, hard concrete, gravel, admixture, water, and the other water-soluble material, directly output the mol concentration and ... concrete, cement, stones, and admixture, concrete mixing water and other water-soluble material. Detection principle: SKCL-C Rapid concrete ... : 1. Weigh sample, add an appropriate amount of distilled water or extract liquor 2. Calibrate electrode and test the ...