Tap gently at the cap (23) with your forefinger in order to detach a mercury drop. After the drop falls, a mercury column front inside the capillary (4) may raise above the end of the capillary by a few mm. Therefore, bring the mercury column front to the end of the capillary with the micrometer screw before extruding the next drop for the best drop size reproducibility.
It is recommended to test the electrode under, e.g., cyclic voltammetry conditions, before using it for research purposes, as illustrated in Figure 7. In this figure, 10 consecutive cyclic voltammograms are presented. Each voltammogram was recorded at a fresh mercury drop formed by turning clockwise the scaled revolving sleeve (7) by 180°.