Hannah nitrate checker?

[ta88brian]

For my 40 gallon reef should i use high range or low?

 

[Jedi Knghit]

High range is the one you want.

 

[jsker]

High range would be the best. Low range is best to test, if one is running an ultra low system. I have the low range test and switched to the high range and have not ever look back

 

[Gtinnel]

The answer is always the high range checker…. well I guess with the one except of a ulns.