The Globe Scientific 3375 Series of Manual Piet Controllers are available in your choice of five colors. They provide easy, accurate filling and dispensing of serological pipets between 0.1 to 100mL. Squeeze the bulb to fill your pipet, then aspirate by moving the analog lever - slightly for slow, more for fast. Blow out is accomplished by pressing the button just below the bulb. Your 3375 is protected by an easily replaced internal 3um hydrophobic filter.