pH Alert Sensor by Seachem.
pH Alert is a unique color device designed to be placed in the aquarium or filter and monitor pH continuously. A sensor changes color reversibly to alert you shifts to in pH levels between 5.8 and 8.2. FRESHWATER ONLY. No tests, no strips, just constant readings.
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Great companion for the Ammonia Alert Review by Derek
This little guy shows you the pH of your tank. Neat. Its clear. Also neat. Put it on the side of your aquarium where it will be somewhat hidden, and you will be able to keep constant tabs on the levels of your tank. (Posted on 12/2/2014)