Grams, Oz's, who's countin'? It will probably be fine (he says as he grabs his loins and rolls his eyes)... I'll drink it with ya man...
Btw, there is much discussion regarding brewing salts and 5.2 in the brew science forum. Many contend, myself included, that 5.2 doesn't get you what you want. It adds unneeded chemicals to your brew and doesn't even buffer at 5.2 (I'm sure I'll now be getting the wammy from the 5.2 guy). If you are starting with RO and use
http://www.ezwatercalculator.com/ by the wickedly brilliant TH (HBT) member you can figure out which salts to add to get you the brew you want. You don't need no stinkin' 5.2, yer a better man than that.. Once you get the correct salts your mash + salts will get you the mash that works and produces just what you want. You can do it!