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Laboratory vessel (4,4)

Ross

I think it could be either:

Which length description are you looking for?:

6

4,4

test tube

(Other definitions for test tube that I've seen before include "Container for precipitation" , "Lab equipment" , "Lab vessel" , "'Laboratory glass cylinder (4,4)'" , "Thin glass receptacle used in laboratory" .)

I've seen this clue in The Mirror and The Independent.
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