I just got an ammonia monitor and it is real time, and lasts for a year. Any reviews? It seems amazing so far. The middle is a little swatch of reactor and it's color coded. Yellow means <0.02ppm, green (alert) 0.05, blue (alarm) 0.2, dark blue (toxic) .5ppm ammonia. Here's what it looks like: it's actually exactly the first pic, the second pic is before they redesigned it but just so you could visualize the concept. They had some for pH, calcium, nitrate, nitrIte, and temp.
God is light, in him there is no darkness at all. 1 John 1:5