Material: Made of plastic and metal, the metal hook is not easy to break, can measure objects repeatedly and is durable. ? Convenient to carry: The manual scale has a spring inside and a scale line is engraved on the outside. The scale is clear and the measurement is accurate. There is a hook at the bottom. It is something you can take with you when you travel. ? Practical tool: It can be a school teaching tool to interest students and explore cognition, or it can be a small accessory to measure the weight of small objects at home. ? The operation is simple and easy to understand: The scale has two calibration forms: Gram and Newton. Just hang the measuring object on the hook, place it vertically, and see at what scale value the spring stops, you can quickly determine the measuring object. ? Package: A set of 2 packs, Spring Balance Scales, 5N, can measure weights up to 500g. ?? Features: --- Spring Balance Scale with ring for easy hanging and S-shaped hook at the bottom for weighing objects. --- Can be used in the classroom to measure the weight of objects and to explore the power and principles of quality physics, it is a good helper for teachers in the classroom and inspires children to explore the world of physics and mathematics. --- The dynamometer is clearly calibrated and the cylinder body is transparent, you can observe the expansion and contraction of the spring through the transparent plastic cover and measure the weight of the item. --- Made of plastic and metal, it has good durability and long service life, the top has a hook that can hang when not in use and will not disappear. --- In a pack of two, you can measure objects with your friends, which is also fun. ?? Specifications: Color: Yellow Shape: Cylinder Material: Plastic and metal Size: 6.69 * 0.78 inches (17 * 2 cm) ?? Package includes: --- A set of 2 pieces, spring ladder, 6.69 * 0.78 inches (17 * 2cm) ?? Attention: Due to the recording light problem, the color of the product may be inaccurate with the photo, please forgive me! Since the size is measured by hand, there is an error, please do not mind! Our products can be returned unconditionally. If you have any questions, you can contact us.