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Used Hanna HI 991300 Waterproof pH-EC-TDS Meter with Probe and Case for Sale at Chemistry RG Cons...
PH Meter,Water Tester 5 in 1 PH/TDS/Salinity/Temp&EC Meter,PH Meter for Water,IP67 Waterproof PH Pen,PPM Meter with Backlit,Salinity Tester for Saltwater Aquarium,Swimming Pool&Seawater.: Amazon.com: Industrial & Scientific
Portable pH/EC/TDS/Temperature Meter with CAL Check™ - HI9813-61