Bengaluru's borewell and lake water quality is a growing concern. Need an affordable, open-source water testing kit that measures TDS, pH, turbidity, dissolved oxygen, and detects common contaminants like nitrates and heavy metals. Should use off-the-shelf sensor probes with an Arduino/ESP32 data logger, mobile app for results, and a public water quality map. Full BOM under ₹5,000.
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