Zero Oxygen Standard Packed 500 mL in the standup pouch
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                                Calitech Zero Oxygen Standard In Single-Use Pouches
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                                Zero Oxygen Standard Packed 500 mL in the standup pouch
                            
                            is a solution of ascorbate and sulfite formulated with anti-microbial. This solution
                            provides a zero standard for proper and accurate calibration. Calibration with Calitech
                            Zero-Oxygen Standard eliminates the errors from electrical (disconnect) zero calibration
                            which arise from internal offsets in the electrode. Because the solution is fresh
                            each time, the problems with homemade solution stability are eliminated.
                            
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