Practical test kit for nickel detection. Detects trace amounts of nickel on metal surfaces and water in 5 minutes. Provides 50 test capacity and easy use....
Ferroxyl surface test kit for detecting free iron, iron oxide residues, and active corrosion points on stainless steel surfaces through blue color reaction....
Professional visual test kit for detecting free iron, iron dust, and metallic residues on stainless steel surfaces after passivation, welding, or grinding....