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HI 771 Checker Handheld Colorimeter Chlorine
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HI 9142 Portable Waterproof Dissolved Oxygen Meter
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HI 705 Checker Handheld Colorimeter Silica
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Science Demonstration: Non-Conductive and Conductive Substances
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HI 9147 Portable Water Resistant Dissolved Oxygen Meter
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HI 96811 Digital Refractometer
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HI 3899BP Backpack Lab
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Science Demonstration: The Effects of Chlorine and pH on ORP Readings in Water
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HI 98201 Oxidation Reduction Potential (ORP) Tester
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HI 701 Checker for Free Chlorine
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Science Demonstration: Influence of Temperature on the Amount of Dissolved Oxygen (DO) in a Solution
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HI 98120 Waterproof ORP and Temperature Meter