via HE website:

What does a perfect dab look like?

We think it looks something like this: When cooked, it will be spread so uniformly even that all will be left in your nail is a golden transparent film. Your nail will look more like a fumed tube of glass than the dirty nail you’ve become familiar with. There will be no puddle, there will be no char, no stains, nothing but the golden film. A film that is so easily wiped up that it’s satisfying just doing so. How can you obtain a perfect dab consistently? With the Highly Educated Control Tower and an IR thermometer its simple. Experience what a dab should be. Feel confident in getting everything out of it, without having to burn any of it. 

Each Control Tower comes WITH an SE Pillar.