ZH-ZZY type volumetric measuring instrument is a toe to evaluate the potency of the drug, to understand the role of time and efficacy of the drug laws by measuring instrument rat paw swelling and inflammation swelling after the procedure. The instrument has a measurement accuracy, timing accuracy, convenience, and the use of modern high-tech advanced technology operating on the instrument compared with similar foreign products in terms of style structure, accuracy is the next level, but for the medium (liquid ) usage requirements and technical requirements for the operation is much lower than similar foreign products, it can be said that the instrument is currently the most advanced, most practical measuring instruments rat paw edema. ZH-ZZY type toe volumetric measuring instrument is in YLS-7C model on the basis of improved measurement accuracy while maintaining the original premise of using the method of operation of computer software, so no secondary input data, which greatly facilitates the experiment the amount of human labor, but also to improve the use of performance and operation of a big step, so that the original operation becomes easier, more convenient, more accurate, more perfect, reached a new higher level.