Constant speed mixers model HTD3070 is a special equipment for preparing cement slurry in oil well cement testing. This instrument is controlled by microcontroller, which changes the traditional mechanical adjustment method. Our constant speed mixers is mainly compose of bracket, slurry cup and cup holder, with the characteristic of simple appearance, convenient use, humanized operation, high control precision and stable speed. It also adopted imported high-quality motor with low noise, high speed and good stability.