Seachem Ammonia Alert

Ammonia Alert continually monitors the level of ammonia in your tank. Tell at a glance if the level is safe, alert, alarm or toxic for your aquarium inhabitants. Reliable monitor lasts more than a year, giving round-the-clock readings of the number one fish killer in marine or freshwater tanks.The unit consists of a waterproof reference color card and a replaceable sensor film. The detecting film, located in the center of the reference scale, changes reversibly from yellow to green to blue relative to the ammonia concentration. A convenient suction cup is included.No test kits, chemicals, or procedures are needed.