In the past, I didn't have a RODI unit and just bought all my water so I took it on faith (probably a bad idea) that it was the right salinity level. Now that I am a using RODI and making my own water, the need for accuracy is there.
I have been struggling a bit with trying to figure out what my salinity is. I have a Hanna HI938319 tester and a Milwaukee Instruments MA887 tester. The Milwaukee has been showing consistently higher than the Hanna for the same water sample. I dug up my manuals and also watched some videos and feel like I got them both calibrated this morning. I used some freshly made water and the Hanna measured it at 1.025 while the Milwaukee measured at 1.027. I have no doubt that the Milwaukee is a better piece of equipment, but it says in the manual that it up to +/_.002 tolerance so that seems to check out. I am a little disappointed that it's off, but at least now I have a baseline and I can just subtract .002 from whatever reading I get.
For those who would suggest a refractometer, I have one and I've tried to use it, but after several eye surgeries, I just can't seem to focus it well enough to get a good reading so I'll have to stick with the digitals.
Just my observations. Happy reefing!
I have been struggling a bit with trying to figure out what my salinity is. I have a Hanna HI938319 tester and a Milwaukee Instruments MA887 tester. The Milwaukee has been showing consistently higher than the Hanna for the same water sample. I dug up my manuals and also watched some videos and feel like I got them both calibrated this morning. I used some freshly made water and the Hanna measured it at 1.025 while the Milwaukee measured at 1.027. I have no doubt that the Milwaukee is a better piece of equipment, but it says in the manual that it up to +/_.002 tolerance so that seems to check out. I am a little disappointed that it's off, but at least now I have a baseline and I can just subtract .002 from whatever reading I get.
For those who would suggest a refractometer, I have one and I've tried to use it, but after several eye surgeries, I just can't seem to focus it well enough to get a good reading so I'll have to stick with the digitals.
Just my observations. Happy reefing!