Yesterday I found something interesting on Indiegogo:
AQUA Spectrophotometer -how to quickly test water?
Wha do you thing about it? The company that sells it has a big documentation about the accuracy.
I am currently fish-in cycling my 20g High tank and recently began using Seachem Prime to condition my water and help control ammonia and nitrite. [My fish have been in great health and I have had no casualties and the fish have shown no signs of stress (eating regularly, not overactive...