Seachem pH Alert™
6 MONTH MONITOR
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 8.6. Freshwater Only.
— Ships from SS: WA, CA, CO, MI, TN, PA, FL USA (not via USPS).