I was thinking to use my medical knowledge for a different purpose. The first image is for a automatic watering, using the drip chamber from the I. V. set. In the second image is the I. V. set. I use the roller for watering.
I use the needle. I will experiment further, because in a few hours, the chamber is empty of water. I must use the tray method and than use the automatic watering. That way, after the pot gets less wet, it will draw the water from the chamber.
Watering by moving the roller (be sure that the set is higher, for the water to drop). I can announce now that this info is from a book a will write in the future.