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Lawn & Patio: 6 in 1 Reader LCD Digital Monitor Water Testing Meter Temperature °C °F pH TDS EC CF PPM w/ Probes Adapter Case for Sauna Pool Hydroponic Aquarium Lab - Generic Brand

Pet Products: Neptune Systems AquaController Apex PM1 PH/ORP Temp Probe Module - Neptune Systems

Photography: Generic Digital PH Meter/Tester Hydro 0-14 Pocket Pen Type Aquarium Color Yellow - Sip Sat Technology Ltd., Co.

Home Improvement: HM Digital ORP-200 Waterproof ORP Meter, -999 to +1000 mV ORP Range, 1 mV Resolution, +/- 0.5% Readout Accuracy - HM Digital

BISS: Etekcity? High Quality Digital Pocket Pen/PH tester/Pen Type PH Meter/Water Quality - Etekcity

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