The Dissolved Oxygen Calibration Kit has everything you need to perform 2-point calibrations in the field, lab, or office. This complete kit is designed specifically for use with the Aqua TROLL 500 and 600 and Includes:

• Battery-powered air pump
• Large bubbler cup with restrictor
• Aquarium stone
• Tubing
• Check valve
• Pinch valve
• 2 alkaline D-cell batteries
• Small calibration cup for calibrating 0% DO
• 500 mL of sodium sulfite solution