Seachem 28658 Alert Combo Pack

Cazaar

Seachem pH Alert Continuous pH readings. No strips. No tests.With suction cup for fixing to the inside of aquiarium glass. pH alert monitor lasts 3-6 months.Freshwater only. One supplied. Brand new, never used, but loose (no box)

Amazon

A year of continuous monitoring No Strips, no tests, just constant readings Monitors pH and ammonia