Photo 1 of 10 in 1 Water Quality Tester PH/TDS/Salt/SG/ORP/EC/Hydrogen/Resistivity/Temp/Nutrient Multifunction Testing Pen for Pool Aquarium Green

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Photo 1 of 10 in 1 Water Quality Tester PH/TDS/Salt/SG/ORP/EC/Hydrogen/Resistivity/Temp/Nutrient Multifunction Testing Pen for Pool Aquarium GreenPhoto 2 of 10 in 1 Water Quality Tester PH/TDS/Salt/SG/ORP/EC/Hydrogen/Resistivity/Temp/Nutrient Multifunction Testing Pen for Pool Aquarium Green