This apparatus demonstrates relationship between capillary pressure & the bore diameter of the capillary tubes.
Comprises of a metal frame arrangement whose base is like a trough. The upper part of frame supports six capillary tubes of different bore.
Fill trough with water and the difference in heights of the resulting columns of water in the tubes is apparent.
Suggestion for obtaining good results: Fill the base with a dark food coloured water, pop the tubes in. After about a minute, take the tubes out, gently wipe off excess liquid and lay them on a white piece of paper so you can better see the difference.

Overall frame height 90mm; Capillary tube length 150mm