This is going way off-topic, but tomatoes need to have a humidity of 75 - 80% for the pollen to develop. Once the pollen are there it should be enough to shake the plant to pollinate
Now in your setup if you do use an automated water top off to maintain water levels in your solution you will wont to monitor concentration of your solution. If you don't use a top off system you still want to monitor concentration (in case of evaporation) so you do not chemical burn your plants.
Hi Billie,Just wanted you to know I'm quietly following all of this after asking early questions... Thanks for showing us so much!
Great link to you tube you just gave me. I found the principle of fault tolerance in the float switches combined with the pH probe quite interesting... I did implement an auto top-off function in my device, but this is just to make sure the nutrient tank doesn't become dry and kills the pump...