Este puede ser en forma de corredera (figura 1), de torno vertical (figura 2) indicado para vasos o copas (recipientes altos), o de torno horizontal cuando los recipientes en que se sirven las muestras tienen poca altura (figura 3).
This may be in the form of a sliding hatch (Figure 1), a revolving vertical device (Figure 2) suitable for glasses or cups (tall containers), or a horizontally-opening hatch when the containers in which the samples are kept are small (Figure 3).
