You are correct about the model I bought from liveaquaria.com. The same refractometer costs $99 @ my LFS
I went to 6 places, including the auto parts store, before finding some distilled water at the CVS drug store.
I'll recalibrate it tomorrow with the distilled water but I'm betting the the problem won't change. We'll see.
Using the hydrometer, I submerged the unit and moved it back and forth a bit to dislodge any air bubbles. Then I raised it out of the water and placed it on a flat surface. Excess water automatically drains off. Swing arm settles pretty quickly. The hydrometer seems
to work well. It may, or may not, be accurate but it is responsive to changes. The refractometer does not seem responsive.
I'll post an update when I recalibrate the refractometer in the morning. My tanks are at the office and I done for the day. Hopefully, all of my LR
should arrive tomorrow and the dip pail will be ready.