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Heron conductivity plus Water Level Meters
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ECTK-231 PH & EC Conductivity Meter Water Quality Tester Continuous Monitor Aquaculture Hydroponics - Tekcoplus Ltd.
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pH/EC Conductivity Meter with ATC Water Quality Tester 0.0-14.0pH / 0~19.99ms... 619317586482 | eBay
Pure Water Meter – Sper Scientific Direct
Handheld Conductivity Meter Tester Lab Water Quality Monitor 762102885847 | eBay
uxcell TDS Meter 2 PPM Conductivity Meter Digital Tester for Water Aquarium Pool: Amazon.com: Industrial & Scientific