Hach Gelex Secondary Standards Kit

Kit includes 1 sealed vial each, 0-10 NTU, 10-100 NTU, 100-1000 NTU. Gelex Secondary Standards Kit, for 2100P and 2100Q Portable Turbidimeters (includes 1 sealed vial each, 0-10 NTU, 10-100 NTU, 100-1000 NTU).