Ensuring that dosing has completed before moving to the next row of wells in a microplate is extremely critical to prevent possible cross contamination. Detection of individual drops from pipettes is possible with Balluff's line of MICROmote micro-optic photoelectric sensors. These sensors can detect a drop of liquid regardless of liquid type or color. Sensing heads are available with beam widths to detect drops within a defined area. In addition, MICROmote light band sensors are available when the defined drop orientation is unknown. The remote amplifiers provide easy setup to teach the sensor to detect liquid droplets.