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M0199720 6-in-1 Water Tester Combo Pen pH, ORP, EC, TDS, Salinity, & Temperature

836-1 Digital Conductivity TDS Meter, ppm ppt uS mS °C/°F Pentype Water Quality Tester with ATC

E-1325M 0-14 pH Electrode Probe BNC Connector, 300cm Cable for PH Meter Monitor Controller Test Sensor, Replacement Kit for Aquarium Hydroponics Plant Pool Spa

868-5 Waterproof pH meter with Temperature + Auto Calibration

8403 Professional Digital Large LCD Dissolved Oxygen DO Meter Tester Handheld Water Quality Tester with Temperature Measurement

ORP-1 ORP Redox Electrode, BNC Type Connector Replacement Probe for Tester Meter Monitor Controller Oxidation Reduction Potential Check, 14cm Long 1.2cm Diameter 300cm Extra Long Cable

PH-803 Digital pH ORP Redox 2 in 1 Controller Monitor w/ Output Power Relay Control, Electrode Probe BNC, Water Quality Meter Online Continuous Measurement Kit, for Aquarium Hydroponics Plant Pool Spa

ECM-231 Online PH & EC Conductivity Monitor Meter Tester ATC, Water Quality Real-time Continuous Monitoring, Rechargeable, for Aquaculture, Aquarium, Pond, Hydroponics

869-0 Professional pH Temperature Meter Tester °C /°F ±0.05pH High Accuracy Portable Water Quality Device

837-2 Salinity & Temp Meter Pen Type Salt Water Quality Tester ATC NaCl, 9999 ppm / 100.0ppt/ 10% / 0.95-1.08 SG Measurement Units 3-in-1 Checker for Saltwater Aquarium Pond Food Pool Cooking Seawater

PHM-224 PH ORP Temperature 3-in-1 Combo Meter Tester Pen Type with Automatic Temperature Compensation