Seachem pH Alert

pH Alert® is a unique color-changing sensor designed to be placed in the aquariumor filter and monitor pH continuously. A sensor changes color reversibly fromyellow to orange to red alerting you to shifts in pH levels between 5.4 and 8.0.Freshwater use only. pH Alert® lasts up to 4X as long as competing products.pH Alert® is also almost half the size of competing products. It’s small, clear,and unobtrusive, so it won’t detract from the view of your aquarium.