Melting point instrument is the usually used equipment in the melting point measurement of the organic crystals, the purity of the crystal material plays a vital role in the production process of product quality. But directly measured the purity of the crystal material is difficult, so in practice,we can determine its purity in order to determine whether they meet the needs of production by measuring the melting point of crystal material. Melting point is important chemical parameters in the material. There...