The Model 20 Constant Speed Blender, 4 Liter, facilitates the preparation of oil well cements and fracturing fluids for testing accordingto API guidelines. Constant speed blenders provide consistent mixing energy to cement slurries to prepare them for subsequent tests.The OFITE Model 20 also provides a means of consistently preparing fracturing fluids for testing. The optional Torque Monitoring Module evaluates the hydration and cross-link times of these fluids.