Ammonia test kits
 

I have a Nutrafin test kit for measuring my ammonia level in the tub of rock.

CAN THEY NOT MAKE DIFFERENT COLORS..... Good grief, all the same shade of green. I can tell the difference....................even with my glasses on. No wonder I have not owned one since 1972

:frusty:

A Seachem Ammo Alert badge would be good enough for your LR tub and they're easy as heck to read

Thanks Greg. I may try that.