NANOCOLOR® Residual Hardness 1 Photometric determination of hardness Calcium and magnesium ions react in alkaline solution with phthalein purple to form a violet dye. Read More »
ชุดทดสอบความกระด้างคงเหลือ Tube Test (0.02 – 1.00 °d and 0.004 – 0.180 mmol/l)
