No, you make it
On second though sure you do

Go to the local drug store and ask the pharmacist to do it for you [smiley=drive.gif]
I forgot, so just in case, so there is no confusion. This 3.6 % solution is to calibrate your refract to SEAWATER. With this solution, on the plate, you want to calibrate it so it reads 35 ppt /or 1.0264. This will cancel the add on

A 3.5 % solution would be to check or calibrate it to 35 ppt NaCl, which is what it was set to at the factory. You don't want that.