Bút đo TDS/ EC HM COM 80 -
HM Digital COM-80 Electrical Conductivity (EC) and Total Dissolved Solids Hydro Tester, 0-5000 ppm TDS Range, 1 ppm Resolution, 2% Readout Accuracy: Tds Meter: Amazon.com: Industrial & Scientific
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HM Digital COM-80 PPM/EC/TDS Hydrotester - PA Hydroponics
Modem GSM/GPRS User manual
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Modem GSM/GPRS User manual
