14 in 1 water hardness strips

14-in-1 water test strips 100 tests aqurium water hardness testing strip Pool Water Test Strips 14 in 1 Water Quality Chemistry Test Strips 100pcs/bottle Product selling point: pool test strips can be used to test pH, total chlorine, free chlorine, total alkalinity, cyanuric acid, total hardness, etc., with more of features that other test strips and liquid test kits Immerse the test paper in water......

...Strip Coil X20Cr13 Type AISI 420A, EN 1.4021, DIN X20Cr13 martensitic grade Corrosion resistant in water and steam. Low-medium hardness for applications such as cutting utensils, surgical instruments, press plates, brake discs and mechanical parts. C Cr 0.16~0.25 12.00~14......