Review on 🔬 Efficient Stainless Steel Transfer Pipettes by Youngever: Essential for Precise Fluid Handling by Sarah Hunter

I really liked the different colors but I was very disappointed when I made some essential oil rollers and for some reason each roller didn't work. This means that the oil did not even flow out of the roller. I thought it was only one but I tried every single one and nothing worked. I don't know how to fix this, but overall I'm disappointed. Generally as if the bottle is empty when full.