stopwatch: a timepiece that can be started or stopped for exact timing (as of a race)
measuring instrument: instrument that shows the extent or amount or quantity or degree of something
paranoid schizophrenia: a form of schizophrenia characterized by delusions (of persecution or grandeur or jealousy); symptoms may include anger and anxiety and aloofness and doubts about gender identity; unlike other types of schizophrenia the patients are usually presentable and (if delusions are not acted on) may function in an apparently normal manner