refractometer

ive had 5 diff ones incl digital. BRS one is the best yet and comes with calibr fluid 35ppt. cant go wrong there even if it is a little more. Bulk reef supply
 
Yes, dont use a hydrometer, when I first started in the hobby I was using one, when I bought a refractometer, I realized the Hydrometer was off my a mile and if I remember I was running my tank at 1.031 or higher salanity and didnt even realize it.
 
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