Seachem Ammonia Alert is a color-changing device that continuously monitors the level of free ammonia in your freshwater or saltwater aquarium. Here's a breakdown of its key features:

• Easy Monitoring: No test kits, chemicals, or complicated procedures are required. The sensor changes color from yellow to green to blue, depending on the ammonia concentration.
• Early Detection: Detects free ammonia levels as low as 0.05 mg/L (ppm), alerting you to potential problems before fish show any signs of stress.
• Long-lasting: Lasts over a year in your aquarium, significantly longer than competing ammonia monitoring products.
• Safe for Fish: Safe for both freshwater and saltwater aquariums.

Here are some additional points to consider:

• The sensor isn't effective at very acidic pH levels.
• While the color provides a general idea of ammonia levels, it's not a substitute for regular water testing with a liquid test kit for more precise measurements.
• The sensor needs a few days to equilibrate with the aquarium water after initial placement.

Overall, Seachem Ammonia Alert is a convenient tool for aquarists to keep an eye on ammonia levels and take corrective actions before ammonia spikes cause harm to fish.