As far as I know, grit is only useful in the gizzard where everything gets mashed up, I may be wrong though. Could you order a scale online? This is the same brand I have-
https://www.amazon.com/GreaterGoods...ed-search-11&pf_rd_t=BROWSE&pf_rd_i=678508011
https://www.amazon.com/GreaterGoods...ed-search-11&pf_rd_t=BROWSE&pf_rd_i=678508011