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Hanna Instruments HI 98129 Waterproof pH/Conductivity/TDS Tester : Amazon.ca: Industrial & Scientific
HI-991300N | Hanna Instruments HI 991300 pH Meter, ±0.01pH Accuracy, 0.01pH Resolution, 16pH Max, +105 °C Max | RS
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HI5521 Research Grade pH/ORP and EC/TDS/Salinity/Resistivity Meter with CAL Check™ - Hanna Instruments (Thailand)
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