Seachem 3 Pack of pH Alert Devices, Continuously Monitors Freshwater for 3 to 6 Months Each auspowers_batchone please carefully turn anchor to Size:1 m please carefully turn anchor to shrink it and remove it from the hole Features Materies: Stainless Steel 316 Each device lasts up to 6 months A sensor changes color reversibly from yellow to orange to red alerting you to shifts in aquarium pH levels between 5
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US$ 27.30