There is a wide range of O2 meters and they work differently. YSI is one maker and there are others. What are your plans wrt the meter ?

Here are a couple of threads

http://forums.pondboss.com/ubbthreads.ph...true#Post433166

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=399826&page=1


Last edited by ewest; 11/03/16 01:53 PM.