No, no, all go back and re- read Randy's article. That 35ppt on that refract is set to a solution of NaCl or table salt. Seawater IS NOT table salt and 35 ppt NaCl DOES NOT = 35ppt NSW. Actually, 35 ppt NaCl = 33.5 ppt Seawater. A refract is a function of light refraction and light does not refract the same way in NSW as it does in a solution of table salt. And the same for those SG conversion numbers on the refract. For Seawater, if you cal that refract in RO/DI water, then in Seawater it needs to read 36.5 ppt to = a 35 ppt Seawater value If and only if it is a real Lab grade refract, which those cheap Chinese ones are not
Refractometers and Salinity Measurement
http://reefkeeping.com/issues/2006-12/rhf/index.php