Liquid-Level-Apparatus-Rapid-52-2664-p-This-liquid-level-apparatus-can-be-used-as-part-of-a-physics-project-to-show-that-the-level-of-liquid-in-connected-vessels-is-constant-irrespective-of-the-vessel-size-or-shape-Consists-of-four-different-glass-vessels-connected-by-a-common-base-tube-p-Rapid-Liquid-Level-Apparatus-230-x-100-x-160mm