this is an inexpensive ways to make your own dotting tool. they work exactly the same as professional tools and they are also very easy to make.
you will simply need 2 things a pencil with an eraser and a straight pin. the top of the pin can be any size you want.
now simply insert the pin into the middle of the eraser. is it comes out a little crooked it's fine because you can easily fix i,t then you are done.
this is what the dots will look like. there is really no difference and you save money.