I am going to start changing my gsp tank over to brackish. I am looking at the refractometers on ebay and amazon because they are much cheaper! Anyway is there anyone that will recommend a specific brand or model number? Any that I should stay away from?
I do have the hygrometer, but quickly learned that it wont go low enough to raise the salinity by .002 sg
per week so at this point it is basically useless!