refractometer
I started this hobby with a coralife deepsix hydrometer (testing salinity) but was always worried with my water changes if I was getting accurate readings. With my last order from J&L's I purchased a refractometer. One thing I found out was that the hydrometer was consistently accurate but they just put all their numbers in the wrong spots. It was reading -.004 to -.005 off the refractometers reading. I would recommend to anyone that has only a hydrometer to test it against a friends or LFS refractometer.
Kevin
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