1. Jul 16, 2008 #1
   

   PotRoast Well-Known ReefKeeper

   999

   Ratings:

   +24 / 0 / -0

   Can I use my TDS/PPM meter to determine specific gravity?
   
   If not, what do I need to buy to make this reading?
   
   
   

    
2. Jul 16, 2008 #2
   

   slovan Experienced Reefkeeper

   1,834

   Ratings:

   +0 / 0 / -0

   
   PotRoast, there are several different types you can use.
   
   Plastic hydrometer - The cheapest and probably the most inaccurate way to measure sg.
   http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=4945
   
   Refractometer - Most practical and efficient way to measure sg.  Requires frequent calibration to maintain accuracy.
   http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4345+9957&pcatid=9957
   
   Floating hydrometer - Probably most accurate since it requires no calibration.  Just need to apply temperature correction factor for anything +/-77 degrees F.
   http://www.tropic-marin.com/web/english/produkte/araeo.htm
   

    

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