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pH Monitor Digital pH Meter&Temperature Meter Water Quality Tester with ATC and Automatic Calibration Function, pH Tester for hydroponics, Aquarium, Pools, etc. (pH Electrode): Amazon.com: Industrial & Scientific
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HANNA Instruments - FC2022 HALO PVDF Body pH Foodcare Electrode with Bluetooth
Bluelab Sonda pH : Amazon.de: Garden
0-14 pH Electrode Probe BNC Connector, 300cm Cable for PH Meter Monitor Controller Test Sensor, Replacement Kit for Aquarium Hydroponics Plant Pool Spa (pH Electrode): Amazon.com: Industrial & Scientific
Sonde - pH Piscine | Piscinepascher.fr
Ph201 Composite PH Electrode BNC Sensor Probe PH Tester Electrode For Chemica US | eBay
Garsent Digital PH Meter, PH Sensor Module + PH Probe, Composite Electrode Test Code Sensor for Aquaponics, Fish Tanks: Amazon.de: Business, Industry & Science