Seachem Alert Combo

Overview The Alert Combo™ pack combines Ammonia Alert® (1 card) and pH Alert® (1 card).
Ammonia Alert® and pH Alert® are almost half the size of competing products.
At 1.5" x 2.5", they are small, clear, and unobtrusive, so they won't detract from the view of your aquarium. Simply place Ammonia Alert® and pH Alert® visibly anywhere in the aquarium or filter.
It’s that easy.
No chemicals or test procedures are required.
Ammonia Alert Ammonia Alert's® sensor changes reversibly from yellow to green to blue, relative to the ammonia concentration.
It detects less than 0.05 mg/L (ppm) free ammonia and alerts you to the #1 killer before any sign of stress.
The presence of the free ammonia is detectable continuously with a response time of about 15 minutes.
Response to decreasing ammonia is slower, requiring about 4 hours to go from TOXIC to SAFE on removal of ammonia.
Marine or freshwater use.
pH Alert pH Alert® is a unique color device designed to be placed in the aquarium or filter and monitor pH continuously.
A sensor changes color reversibly from yellow to orange to red alerting you to shifts in pH levels between 5.4 and 8.0.
When first put in service, pH Alert® response time will be about 30 minutes.
Thereafter, pH shifts will register within ten minutes.
Freshwater use only.