Invigilator. This is the term used here for exam proctors: people who keep watch over students while an exam is ongoing to ensure that they don't cheat. I gather that this is a British term. I had never heard of it before. I will be the main invigilator for my exams. I may have a second invigilator assigned to my exams as well. It is unclear if I will be a secondary invigilator for another staff member, but if asked, I will serve.
Dolorimeter. This is an instrument used to measure pain threshold. I found mention of it when I was looking through an intro physics text. The dolorimeter I read about exerts a pressure on ones skin. (It was an end-of-chapter exercise in a chapter about pressure.) Apparently there are other types of dolorimeters, as well.
The root of the term is the Latin word dolor (doloris), whose first definition is pain, ache, or hurt. The second definition is grief, sorrow, or anguish. (Why do people name their daughters Dolores?) Anyway, it was the second definition that came to mind when I first saw the physics problem: I imagined a device capable of measuring someones sadness.