Sulfite (Sulfitest) Reagent (Photometer) Home Products Sulfite (Sulfitest) Reagent (Photometer) Sulfite (Sulfitest) Reagent (Photometer) Pack Size: Add to Enquiry DESCRIPTION Test for Sulfite in boiler water. Range: 0 – 500 mg/L Na2SO3 Product Code: AP266 APPLICATION Coming Soon