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HANNA Instruments EC/TDS測試筆 - 高範圍 HI98312
DiST® 6 EC/TDS/Temperature Tester (0.00 to 20.00 mS/cm) - HI98312
HANNA Instruments 硼離子化學測試組(100劑測試) HI38074
Boron Chemical Test Kit for Irrigation Water - HI38074
HANNA Instruments 基礎級 TDS 1,500 ppm (mg/L) 標準液 500 mL HI70442L
HI70442L 1500 mg/L (ppm) TDS Calibration Solution (500 mL Bottle)