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Máy Đo Ph/Ec/Tds/Nhiệt Độ Cầm Tay Hi 9813-5 (0.0 To 14.0 Ph; 0.00 To 4.00 Ms/Cm; 0 To 1999 Mg/L; 0.0 To 60.0°C) | HANNA.VN