Seachem 3 Pack of pH Alert Devices, Continuously Monitors Freshwater for 3 to 6 Months Each Trading Cards the pads would make a

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Seachem 3 Pack of pH Alert Devices, Continuously Monitors Freshwater for 3 to 6 Months Each Trading Cards the pads would make aBrand: Seachem Features: 3 pack of Seachem pH Alert devices No chemicals or test procedures required Continuously monitor pH levels in freshwater aquariums or filters Each device lasts up to 6 months, 4 times as long as competing products A sensor changes color reversibly from yellow to orange to red alerting you to shifts in aquarium pH levels between 5. 4 and 8. 0 model number: 20 Part Number: 20 Details: pH Alert is a unique color device designed