Balance

The utility model provides a balance which comprises a support, a balance rod, a first balance hole, a second balance hole, a middle balance hole, a first cantilever rod, a second cantilever rod, a middle hanging rod, a tray, a force application assembly and a limiting connecting rod. The middle bearing and hanging rod is fixed to the center of the balance rod in a penetrating mode, the two ends of the middle bearing and hanging rod are hung in the middle balance holes, and the middle bearing and hanging rod makes linear contact with the middle balance holes; a first cantilever rod and a second cantilever rod are installed at the two ends of the balance rod respectively, a first balance hole and a second balance hole corresponding to the first cantilever rod and the second cantilever rod are formed in the upper portions of the two force application assemblies respectively, the first cantilever rod makes linear contact with the first balance hole, and the second cantilever rod makes linear contact with the sec