Different machines testing for same thing

For a chemistry report, we were given a sample of water and a variety of machines to test it with - giving their respective results about whatever aspect they were testing (eg pH, metal ion concentration etc). However the issue is that two of the machines tested for the same thing (concentration of metals in the water). What should I do in this case, now that I have 2 sets of data about the same thing? Should I discard one? Should I keep both and use it for comparison (although the results do differ somewhat between them)? I feel that doing something like averaging would be very invalid, and it has me very conflicted.


If it helps, the machines in question are AAS and ICP.


