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Apera Instruments TN500 Portable White Light Turbidity Meter with Data Logger, EPA 180.1 Compliant (AI483): Amazon.com: Industrial & Scientific
TN400-S1 AMCO Polymer Standard Calibration Solution Set for Apera Instruments TN400 Turbidity Meter | Scilogex
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HI93703-05 - AMCO-AEPA-1 Calibration Solution at 500 FTU (30 mL) by Hanna Instruments: Amazon.com: Industrial & Scientific
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