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hydrometer or refractometer

PostPosted: 04 Sep 2015, 20:16
by skypimp3
Hi i recently set up an orbit 20 . the salinity was to high so i removed some water and replaced it with some RO water.
I got a refractometer as i read somewhere these were more reliable, on testing the water again i used both hydrometer and refractometer getting differant readings , hydro giving me 32ppt and the refracto giving me 34ppt .

what is more reliable ?

how do i calibrate the refractometer ?

should i be checking anything else in the water or do i just keep an eye on the salinity, the tank has been set up and running for over 3 weeks now and im wanting to stock it with probably 3 moons .

all advice here is welcomed

Re: hydrometer or refractometer

PostPosted: 12 Sep 2015, 02:10
by Cubic
A refractometer is far more reliable than a swing hydrometer because it doesn't go out of calibration in the same way. A small build up of salt on the arm of the hydrometer will cause it to lose calibration so its very important to wash it well with fresh water after you use it each time.