It's a lovely extra large pestle and mortar for breaking up soil, made to order from recycled oak kitchen worktops by Terry Vaughan (http://www.turnedwoodenbowls.com/). Far cheaper than buying a ceramic one from VWR or Fisher and far more satisfying to have in the lab. as well. Cheers Terry, good job.
I hope the correct tendering process was carried out before this was bought!
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