(1/5 second meter (30 minute total) 7 single stone use) Measures up to 30 minutes in 60 seconds per circumference Press the crown to activate start, stop, and return to the hand. It is most used for sports and easy timekeeping. It is said to be 1/5 seconds from where it can be used to calculate 1/5 seconds. Please wind up the crown before use. (Hand-winded) Product Size (H x W x D): 2.8 x 2.2 x 0.7 inches (70 x 55 Weight: Approx. 3.5 oz (100 g) Single 1/5 second Times up to 30 minutes Color White Brand Name Hanhart Unit Count 1.0 Count Manufacturer HANHART(ハンハルト) Model Number 112-05T Material Type Metal Number of settings 1 Manufacturer Part Number 112-05T Item Dimensions D x W x H 0.7 D x 2.2 W x 2.8 H