Seiko 8T63 Manual - Page 6

English SECURITY LOCK BUTTON OPERATION (for models with security lock button) SECURITY LOCK OF PUSH-BUTTON A & B Locking A Unlocking Locking B Unlocking Unlocking the push-button - Turn Security Lock Button counterclockwise until you no longer feel the threads turning. - The button can be pushed in. Locking the push-button - Turn Security Lock Button clockwise until you no longer feel the threads turning. - The button cannot be pushed in. 10 TACHYMETER (for models with tachymeter scale on the dial) To measure the hourly average speed of a vehicle 1 Use the stopwatch to determine how many seconds it takes to go 1 km or 1 mile. 2 Tachymeter scale indicated by STOPWATCH second hand gives the average speed per hour. Ex. 1 STOPWATCH second hand: 40 seconds Tachymeter scale: "90" "90" (tachymeter scale figure) x 1 (km or mile) = 90 km/h or mph l Tachymeter scale can be used only when the time required is less than 60 seconds. Ex. 2: If the measuring distance is extended to 2 km or miles or shortened to 0.5 km or miles and STOPWATCH second hand indicates "90" on tachymeter scale: "90" (tachymeter scale figure) x 2 (km or mile) = 180 km/h or mph "90" (tachymeter scale figure) x 0.5 (km or mile) = 45 km/h or mph 11 English