Does the yard you go to have an XRF gun to verify exact composition of metal?

I'm trying to figure out if it is pretty standard for a yard to have one of these. I've found a few yards that will sell some items I'm looking for but I would really like to verify the alloy type and basically the types of metal's and % of them in each thing I'm buying.



Some of the things like lead that I want to make sure don't have zinc contamination and if there is antimony in it, I'd like to know how much. Other things like brass, bronze and aluminum (especially cast) I've found can have some pretty different compositions than what I expected, so again, I'd like to check first.

IDK if any of you do metal casting or metal working of any form but I would like to be able to find a place that will scan (with the XRF gun) metals that I buy or metals that I cast (maybe some ingots I will use in the next casting process & I want to be 100% sure of it's composition). So not all the metals will be purchased at the yard (they might not even sell to the public) but I'd be willing to pay a reasonable rate at a time when they aren't too busy. If anyone has any suggestions on how I should approach a yard that has a scanner/gun, I'd appreciate it!