A device is disclosed, being an analysis device for the study of biological or chemical samples by means of a reagent liquid supplied via a pipette. The optical engine module includes a casing having four sidewalls defining an optical path. A second zone is adjacent the first zone, the second zone having a second coefficient of friction higher than the first coefficient of friction. The control signal is then used to produce an output signal that turns the device on and off, wherein the output signal has a cycle period during which a pulse of a given duration occurs. A method of power management is provided whereby the transmitter circuitry is powered down at appropriate times and a minimum number of active links is maintained to maintain the integrity of the state of the logic in the receiver circuitry. Products ranging from viscous liquids, creamy gels, pastes, and soft powders may be obtained.