yes, I like how easy the pinpoint is as well, I just want to get a refractometer to make sure it is accurate..
can never be too safe.
Hydro I have a 30 gallon sump/refugium with a rio 14 HF pump that returns the water, plus I have a velocity T4 pump hooked up to an OM squirt for my closed loop system. when I get home tonight I will snap a few pics and post them.