Abstract: A dispenser unit preferably adjustable for either single dose or multiple dose dispensing of fluids; primarily for the precision dispensing of small volumes (e.g. volumes measured in microliters). The unit includes an elongate actuator rod axially moveable in one direction to dispense the fluid, and a hand-engageable dispensing lever including a passageway through which the actuator rod extends. A measured, or predetermined quantity of the fluid is dispensed by manually applying a force to the lever in the one axial direction to maintain a canted relationship between the lever and actuator rod. This canted relationship causes surfaces of the passageway to lock against the actuator rod, and the axially directed manual force on the lever will move the rod to dispense the fluid.