Epipens Are a Good Pencil, but You Can't Test Them.

You can build it for a little over 30 dollars us. And you can reload it for about three dollars, unlike the apipen which is,. i think it's about six 650 15 dollars for ye um. But the other two critical differences are that epipens are single use, so you can't test whether it's faulty or not until you use it and there have been a lot of failures.