Ammonia Alert

We started using these ammonia testers many years ago and they work great! Ammonia Alert is an innovative color device for continuously detecting and monitoring toxic free ammonia. A sensor changes reversibly from yellow to green to blue, relative to the ammonia concentration. No test kits, chemicals, or procedures are needed. The device detects less than 0.05 mg/L (ppm) free ammonia and alerts you to the #1 killer before any sign of stress. It lasts over a year before needing replacement. Marine or freshwater use. No care is required beyond removing algae with a clean, soft material.