A flow cytometer system for moving micro-entities between a first location and one or more additional locations in a fluid stream, the system comprising: detection apparatuses (D1, D2, D3, D4, D5) to detect the presence of a micro-entity at the first location and each of the one or more additional locations; and a drop clock that is used to time the formation of droplets in the flow cytometer system; and one or more processors configured to: receive a first signal, for each of a plurality of micro-entities, indicating a first arrival time at the first location; measure, for each of the plurality of micro-entities, a respective delay time (Δt dc), wherein the respective delay time (Δt dc) is measured between the first arrival time and a reference point of a periodic signal generated by the drop clock; receive additional signals, for each of the plurality of micro-entities from each of the one or more additional locations, indicating one or more respective additional arrival times at each of the one or more additional locations; measure, for each of the plurality of micro-entities, a respective deviation for each respective additional arrival time from a respective expected arrival time at each of the one or more additional locations; and store the measured respective delay times (Δt dc) in association with the measured respective deviations. detection apparatuses (D1, D2, D3, D4, D5) to detect the presence of a micro-entity at the first location and each of the one or more additional locations; and a drop clock that is used to time the formation of droplets in the flow cytometer system; and one or more processors configured to: receive a first signal, for each of a plurality of micro-entities, indicating a first arrival time at the first location; measure, for each of the plurality of micro-entities, a respective delay time (Δt dc), wherein the respective delay time (Δt dc) is measured between the first arrival time and a reference point of a periodic signal generated by the drop clock; receive additional signals, for each of the plurality of micro-entities from each of the one or more additional locations, indicating one or more respective additional arrival times at each of the one or more additional locations; measure, for each of the plurality of micro-entities, a respective deviation for each respective additional arrival time from a respective expected arrival time at each of the one or more additional locations; and store the measured respective delay times (Δt dc) in association with the measured respective deviations. receive a first signal, for each of a plurality of micro-entities, indicating a first arrival time at the first location; measure, for each of the plurality of micro-entities, a respective delay time (Δt dc), wherein the respective delay time (Δt dc) is measured between the first arrival time and a reference point of a periodic signal generated by the drop clock; receive additional signals, for each of the plurality of micro-entities from each of the one or more additional locations, indicating one or more respective additional arrival times at each of the one or more additional locations; measure, for each of the plurality of micro-entities, a respective deviation for each respective additional arrival time from a respective expected arrival time at each of the one or more additional locations; and store the measured respective delay times (Δt dc) in association with the measured respective deviations.