Compare with the other types, this reusable LED Nurse penlight is push button to click on and off instead of holding the clip down to keep the light stay on throughout the entire use, which makes use way more efficient and simply. This penlight has a silver metal clip rather than plastic that you can clip on your shirt or scrubs, no need to worry clip will break in your line of work. Clean sleek white color Pupil Gauge design and the pupil gauge on the side is also convenience to pinpoint lens directly ears and throat. The medical led penlight has a handy dandy little pupil dilation gauge which is incredibly helpful if you are learning how to visibly measure pupil dilation.