These mixers feature a through-shaft design that permits adjustment of shaft length and impeller depth—allowing you to place or remove mixing vessels without repositioning the mixer. The motor and drive unit are conveniently integrated into a compact aluminum and thermoplastic housing with easy-to-use controls and a clear LED display of rpm. Mixers feature infinitely adjustable stepless speed control. Continuous comparison of shaft speed to desired speed is maintained and variations are adjusted automatically. This guarantees a constant speed even with changes in fluid viscosity. Quiet, fan-cooled motors feature thermal overload shut-off, and an efficient heat-dissipating design to ensure a long service life. Motor is maintenance-free and rated for continuous duty. Safety circuits ensure automatic cut-off in an anti-stall or overload condition.