
When measured, tap water showed 258 units, after reverse osmosis 10! With a tolerance in the table from 0 to 50, ideal water for drinking! Decide for yourself!

Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
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🌡️ Continuous Temperature Monitoring with Relative Humidity Integration
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Portable Handheld Manometer 📏 for Accurate Pressure Differential Measurement
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