That thing is a Sonogram or a vaginal ultrasound. They usually have a protective cover that goes over them kind of like a condom. Obviously this douche has no idea that you're supposed to be gentle and ease it in.
I have shown this to a few females & they all agree its a 'sonic-gram' that's being performed. Out of the set of about a half dozen of these vids I've seen, this one -with the youngest 'doctor'- takes the cake. He makes her squirm by pushing that instrument fast & hella deep. Its probably the biggest thing ever to venture up inside her...ever.