chronograph
From Longman Dictionary of Contemporary EnglishRelated topics: Chronologychronographchron‧o‧graph /ˈkrɒnəɡrɑːf $ ˈkrɑːnəɡræf/ noun [countable] TMCa scientific instrument for measuring periods of timeExamples from the Corpuschronograph• A precision water-resistant chronograph for only %295!• The chronograph is the timepiece of choice for today's active man-on-the-go.