The SONARtrac HD VF/GVF-100 flow meter is the ultimate combination of our volumetric flow and gas volume fraction meter coupled with the durability of the HD (high dispersion) series. The HD VF/GVF-100 was designed specifically to provide accurate and reliable flow and entrained air measurements for difficult to characterize mixtures and slurries with varying velocities and densities. This product is recommended for middlings slurries with greater than 30% solids.