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Features: ? Solid wood is strong and durable Iron ring firmly and easily hanging Strong support for metal struts Fine balance adjustment on both ends Uses: This lever rule is used for the experimental use of the balance of physics teaching, and can also be used for teachers to demonstrate experiments. Structure: hook, adjusting nut, screw, shaft shaft, wax line Both ends of the shaft are equipped with screw nuts for leveling, and the adjusting nut can adjust the shaft to a horizontal level. When the shaft is in a horizontal position, the lever is in equilibrium, and the rod has four movable hooks. ? Specification: ? Brand: KEPU Model: J21030 Material: Wood Size: 50*2*1cm ? Package includes: ? 1 * 50cm Wooden Lever Ruler