Material: This product is made of ABS and stainless steel shell, durable and practical. The electronic weighing device is a dynamometer specially designed for archery.When you pull the strong knot, it records the instantaneous maximum value of the whole process. The unit adopts the international pulling unit, which can measure up to 50 kg . The battery uses 1 CR2032 battery. Built-in backlight for easy reading. There are hooks on the bottom of the product to facilitate measuring tension or measuring the weight of the item. Features: The electronic weighing device is a dynamometer specially designed for archery. When you pull the knot hard, it records the instantaneous maximum value of the whole process. This product is made in ABS and stainless steel shell, durable and practical. The battery uses 1 CR2032 battery. The unit adopts the international traction unit, which can measure up to 50 kg. Features: Name: arc ladder. Materials: ABS and stainless steel. Color: silver. Maximum measurement: 50 kg. Unit: kg/g/lb/oz (switch by yourself). Display: LCD screen. Low power display : LO_ Overload display: O_Ld. Dimensions: approximately 152 x 30 x 40 mm. Powered by: 1 CR2032 battery (built-in). Contents: 1 arc ladder. Notes: Conversion: 1 cm = 10 mm. 1. The color of the item may vary from the photo depending on your computer's display and brightness settings. Thank you! 2. Due to manual measurement, the sizes shown may vary by 1-3 cm.