PTL Hermann specializes in high-quality vibrating level switches for bulk solids like powders and granules, featuring patented single-rod designs (LevelSwitch, Stocktrol) that prevent bridging and build-up, offering sensitivity for light materials (down to 10g/L) and robust construction for heavy materials like cement, with models for standard, high-temp (SHT), and hazardous (ATEX) environments, providing reliable level detection in silos and tanks.