shandong juancheng hualu electric heating instrument co., ltd. is a manufacturer of series electric heating sleeves. shandong juancheng hualu electric heating instrument co., ltd. has strong technical strength and advanced technology. shandong juancheng hualu electric heating instrument co., ltd. has developed into a series of hualu electric heating cover series; electric heating plate series temperature control (glass fiber), magnetic, electric mixer; water bath pot; digital temperature control instrument; rapid automatic measuring instrument for crude oil water content; crude oil sampling barrel cleaning machine; circulating water cooling tower; laboratory instruments and other series of petroleum product analysis instruments and oil test instruments; teaching aids and other eight series of more than 30 varieties and more than 100 specifications of products.