Seachem Ammonia Alert - 1 Year Continuous Monitor for Freshwater & Marine Aquariums

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. Marine or freshwater use.