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EZDO TDS測試筆 經濟型 5031
Pen type TDS Meter
HANNA Instruments 低濃度水硬度化學測試組(約50次測試) HI3840
Total Hardness ( 0-150 mg/L) LR Chemical Test Kit - HI3840
PEACOCK 厚薄計 指針式
Thickness Gauge, Dial
HANNA Instruments 防水型手持式EC/TDS/比電阻/鹽度/溫度測試儀 HI98192
Waterproof Portable EC/TDS/Resistivity/Salinity Meter - HI98192