Each observer should check and readjust the height of the apparatus on the support rod to the best viewing height for each Person.
One of the main reasons that spheres could be hard to view is improper microscope focus; check by pushing in the injector nozzle and focusing on the tip.
The stem of the atomizer attached to the injector bulb should be positioned with its tip at the bottom of the reservoir to allow use of a minimum quantity of sphere fluid.
Before storing the apparatus, return the diluted sphere fluid to a storage bottle and thoroughly clean the injector, reservoir, and viewing chamber by rinsing with distilled water.