Material: Made of plastic and metal, the metal hook is not easy to break, can measure objects repeatedly, and is durable.Convenient to Carry: Manual scale has a spring inside and a scale line is engraved outside. Scale is clear and measurement is accurate. There is a hook at the bottom. is something you can take with you when you travel.Practical Tool: It can act a school teaching tool to engage students and explore cognition, or it can act a small prop to measure the weight of small objects at home.Operation is simple and easy to understand: The scale has two calibration forms: Gram and Newton Just hang measuring object on the hook, place it vertically and see at what scale value the spring stops, you can quickly determine the measuring object.Packaging: A set of 2 packs, Spring Balance Scales, 5N, can measure weights up to 500g. Features: --- Spring scale Scale with ring for easy hanging and S-shaped hook at the bottom for weighing items objects. --- Can be used in the classroom to measure the weight of objects and to explore the power and principles of quality physics, is a good helper for children teachers in the classroom and inspires children to explore the world of Explore 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 item. --- Made of plastic and metal, it has good durability and long service life, the top has a hook which 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: Yellow Shape: Cylinder Material: plastic and metal Size: 18*2.1cm Package includes: Attention: Due to the recording light problem, the color of the product may be inaccurate with the photo, please excuse! As the size is measured by hand, there is an error, please do not disturb! Delivery Quantity: 2 pieces Product color: yellow Note: Manual measurement, please allow 1 - 3cm error!!! " The manual scale has a spring to 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's something you can take with you when you travel.Practical tool: It can be a school teaching tool to engage students and explore cognition, or it can be act as a small accessory to measure the weight of small objects at home.The 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 what scale value the spring stops at, you can quickly determine the measuring object.Packaging: A set of 2 packs, Spring Balance Scales, 5N, can measure weights up to 500g. < p> Features: --- Balance Balance spring 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 grade physics, it is a good helper for teachers in the classroom and inspires children to explore the world of Explore 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 two-pack, you can measure objects with your friends, which is also fun. Specifications: Color: Yellow Shape: Cylinder Material: plastic and metal Size: 9*2.3cm Package includes: --- A set of 2 pieces, spring ladder, 6 .69*0.78inch(17*2cm) Attention: In Due to the recording light problem, the color of the product may be inaccurate with the photo, please excuse me! As the size is measured by hand, there are has an error, please d