What to look for in a spoon and fountain
With the spoon there are three things to check. It has to be longer than the diameter of your glass, otherwise it tips at the slightest nudge; a spoon of around fifteen centimetres sits stably on virtually any absinthe glass. The perforation determines how quickly the water passes through, and stainless steel is the material of choice because absinthe is distilled strong and silver-plated metal turns dull from it over time.
With the fountain, what counts most is the number of taps. A model with four taps serves four glasses at once, which is the difference between a trick for yourself and something a whole group can gather around. Also check whether the taps can be operated separately and whether they adjust finely enough to actually reach one drop per second; a stream you cannot tame makes the fountain unusable.