The Reef Tank banner


  1. General Reef Discussion
    Can I just use RO/DI to calibrate my refractometer to 0 or do I have to use a special fluid??
  2. General Reef Discussion
    its an automatic temp correcting type, i bought the calibrating fluid rather than try to make my own. the fluid and instrument have to be at the same temp according to instructions for first time cal. , the fluid says it likes to be at 77*F. What is an easy way to make sure they are at...