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Hanna Instruments HI 9813-6N Waterproof pH/EC/TDS Temperature Meter Clean and Calibration Check for Growers, 0 to 50 Degree C, 9V Battery: Amazon.com: Industrial & Scientific
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Italian Hanna Ph Meter Hi98129 Hi98130 Multi-parameter Ph/ec/tds Analyzer Water Quality Analyzer - Instrument Parts & Accessories - AliExpress
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