A client asked me how big a sample of drill cuttings I needed for
processing so I told him about one tablespoon. From a subsequent memo,
it was obvious that he thought that that was 1-2ml! I told him that it
should be 15ml but he didn't believe me.
It put me in mind to check the actual capacities of the spoon set that I
have, a set of what I though was of decent quality. I weighed spoons of
water and found the following:
1Tbsp = 13 ml (not15ml)
1tsp = 5ml (accurate)
1/2tsp = 3ml.

Of course there's no guarantee that any replacement spoon set would be
accurate. My measuring cups are within the limits of the meniscus except
for the 1/3 cup which is close to 90ml.
Some might think that this is "anal" but if you stop asking questions,
you might as well move into a nursing home!
Graham