Pay in 4 interest-free payments of $4.08 Learn more
Ships within 48 hours · Estimated delivery Sep 6 - Sep 11
Sold out for 2026
Choose the pre-bagged 8 oz
One year warranty on meter
Not approved for use on fish intended for human consumption
Ammonia Alert Crystal Sold out for 2026Ammonia Alert is an innovative colour device designed for continuously detecting and monitoring toxic free ammonia. The internal sensor changes colour reversibly from yellow to green to blue, relative to the ammonia concentration. The device detects less than 0. 05 mg l free ammonia and lasts over one year. Put one in every aquarium and tank.
