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I think I'm going to get one of these with a 500 ml plastic test tube.
good choice, remember to test at 77f so get a good thermometer, if the temp is not at 77f it will read high/low, you can use this to correct it.
Salinity Correction Calculator
Aquarium calculator; Correct a relative specific gravity (sg) measurement taken with a non-temperature-correcting unit.
www.hamzasreef.com
but I run my tank slightly higher than 77f, time I get it into the container it’s exactly 77f so no chart needed.