SE 1 Bulb Disposable Flashlight with Pupil Gauge - FL1021BULK | Medical Penlight for Nurses, Doctors & Emergency Kits | Perfect for Eye Exams, First Aid & Clinical Use

I didn't like reading the caution... that the product contained known cancer causing elements. Then there was the fact that there were no instructions on how to use the product. I tried to turn both pens on... batteries terminals are sticking out one end, and there's no way to replace them. I'm not very fond of either of these two things. They will be going in the trash. I have LHON, and when I'm going to use an object near my eyes, I don't want to read it can cause cancer. Toxic products are not for health.works well, bright enough for nursing applicationsGreat product for therapy for my son.Great! Take to work everyday and always works!ok