Material: Made of plastic and metal, the metal hook is not easy to break, it can measure objects repeatedly, and it is durable. Easy to carry: The manual scale has a spring inside and a scale line engraved on the outside. The scale is clear and the measurementis accurate. There is a hook at the bottom. It's something you can take with you when you travel. Handy tool: It can be a teaching tool in schools to stimulate students' interest and exploration cognition, or it can be a small prop for measuring theweight of small objects at home. The operation is simple and easy to understand: the balance has two calibration forms: gram and newton Just hang the measuring object on the hook, place it vertically and see at what value d' the scale spring stops,you can quickly determine the measuring object. Packaging: Set of 2, Spring Scale, 5N, can measure up to 500 grams. Features: Spring scale balance with loop for easy hanging, bottom S-shaped hook for weighing objects. It can be used in classroomsto measure the weight of objects to explore the power and principles of high-quality physics. It is a good helper in teachers' classrooms and inspires children to explore the world of physics and mathematics. The dynamometer is clearly calibratedand the barrel is transparent. You can observe the expansion and contraction of the spring and measure the weight of the item through the transparent plastic cover. Made of plastic and metal for durability and long life, there is a hook on the topthat hooks on when not in use and doesn't disappear. In a two-pack, you can measure objects with friends, which is also fun. Specifications: Color: Yellow, Shape: Cylindrical, Material: Plastic Quantity shipped: 2 pieces Package Contents: Only the above package contents, excluding other products. Size:18*2.1cm (Reminder: The size is measured by hand, please allow 1-2 cm measurement error) Color: yellow (Due to different monitors and lighting effects, the actual color of the product may be slightly different from the picture color.)