The electrospinning check tool p/n 100-70-01 is used to check the validity of your electrospinning process. This stainless steel tool enables the user to verify if fiber is being produced by running the spray across the openings. If fiber is being produced, then the fiber will be visible over the hole; otherwise, the electrospinning spray will fall through the holes. This is a quick, easy way to verify in less than a minute whether or not your electrospinning device is producing fibers properly and can be done without using a microscope.