The PRO250 homogenizer unit is a perfect fit in between the Bio-Gen PRO200 homogenizer unit and PRO digital homogenizer units. It's lightweight enough to be used handheld, yet has extra torque for processing larger and/or difficult samples. Two optional stands are available for the PRO250 homogenizer. A separate ON/OFF switch effortlessly allows for the dial knob speed control to remain at your ideal homogenizing speed.