Science & Exploration Sets features: This is a practical spring scale for testing force and gram weighing. Each scale is equipped with a hanging ring at the for easy hanging, and a hook at the bottom for attaching the item to be weighed. This spring scale is designed with 25N/ 2500g measurement ranges, measuring in both "g" and "N", which is suitable for classroom and field applications to measure weight and to explore physics principles of force and mass. With clear calibrations and transparent cylinder design, it& 39;s easy to read markings. Premium stainless steel spring and hanging hook ensures great rigidity, sturdiness and corrosion resistance. Features Color: Yellow. Material: Plastic. Size: 18.00X1.50X1.50cm/7.07X0.59X0.59inch. The spring scale is made of premium spring and hanging hook, which ensures great rigidity, sturdiness and corrosion resistance. This is a spring dynamometer, with two scales are suitable for different needs. Lightweight, reasonable size, easy and convenient to carry and store. Suitable for physics classroom, laboratory use. Deepen your understanding of force power and improve your interest in learning. The efforts and fine craftsmanshlp we put into the making of this product make for superior reliability.