HM Digital TDS Tester – Pocket-Size Water Quality Meter, Factory Calibrated maifan stones Unscrew the plastic wing nut

Unscrew the plastic wing nut

Social mission: Every Gravity Water System purchase provides 100 days of clean drinking water to communities living in water poverty

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Thread the stem of the new filter through one of the four holes on the bottom of the upper chamber

HM Digital TDS Tester – Pocket-Size Water Quality Meter, Factory Calibrated maifan stones Unscrew the plastic wing nutHM Digital TDS Tester Affordable, Accurate Water Quality Testing The HM Digital TDS Tester is a compact, easy to use meter designed for quick and reliable Total Dissolved Solids (TDS) measurement. Whether you're testing drinking water, monitoring a hydroponic reservoir, checking aquarium water quality, or verifying RO filter output, this pocket sized tester delivers instant results without breaking the budget. Key Features Measures Total Dissolved