Portable Waterproof pH/EC/TDS Low Range Meter (0 to 3999 µS/cm, 0 to 2000 ppm) - HI991300
:quality(80)/tamarack/catalog/medidor-ppm.jpg "Medidor de PPM de Prata Coloidal | Tamaracky")
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Hofun TDS Meter Digital Water Quality Tester, TDS, Temperature & Conductivity Meter 3 in 1, 0-4999 ppm, EC Meter, Digital Water Hardness Testers for Drinking Water, PPM Meter for Hydroponics Aquarium: Amazon.com:
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