Replenishes the SO2 Reactant supplied with the SC-100A, the SC-100 and the SC-300Analyzer kits. Good for up to 225 SO2 tests. Guaranteed for 6 months. To avoid cross-contamination with other reagents, use a dedicated pipette to dispense the SO2 reactant. Store reactant in a dark, cool place with the bottle tightly sealed to maximize shelf life.