ORP negative reading

[reefrubble]

I have a ACII,and I want to know ,is there any way to have it read in the negative range? I want to add a sulphur reactor to my system,and I will need to get a reading around -300.

 

[clp]

Our controllers can only measure positive orps.

Curt

 

[reefrubble]

I was afraid of that . Now I have to buy something else. Thanks for the reply . Ted