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 from yellow to orange to red alerting you to shifts in pH levels between 5.4 and 8.0. Freshwater use only.

• Continuously monitors pH in freshwater
• No tests or strips required
• Lasts 3-6 Months
• First response time in 30 mins!

Includes 1 sensor technology card (1.5" x 2.5")