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 precise. There is a hook at the bottom. It's something you can take with youwhen you travel.Handy Tool: It can be a school teaching tool to interest students and explore cognition, or it can be a small prop to measure the weight of small objects at home.Operation is simple and easy to understand: The balance has two forms of calibration: Gram and Newton Just hang the measuring object on the hook, place it vertically and see at what value d 'scale the spring stops,you can quickly determine the measurement object.Packaging: A set of 2 packs, Spring Balance Scales, 5N, can measure weights up to 500g.Features:Spring balance Balance 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 Explore physicsand 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 snag when not in use and will not disappear.In a two-pack you can measure objects with your friends which is also fun.Specifications:Color: YellowShape: CylinderMaterial: plastic and metalSize: 6.69 * 0.78 inch (17 * 2cm)The package includes:A set of 2 pieces, spring scale, 6.69 * 0.78 inch (17 * 2cm)Warning:Due to the recording light problem, the color of the product may be inaccurate with the photo, please excuse meSince the size is measured by hand, there is an error, please do not disturb