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Pen Type Salinity & Temperature Meter ATC Calibration Solution Set ppm / ppt / % / S.G. 4 Units Salt NaCl Water Quality Tester|PH Meters| - AliExpress
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Pen Type Salinity & Temperature Meter Water Quality Tester ATC ppm / ppt / % / S.G. 4 Units Salt NaCl for Hydroponics Lab Pond|PH Meters| - AliExpress
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