The present disclosure relates to a system configured to inject objects, such as eggs, with a fluid, wherein said objects each comprise at least two object parts, such as embryo tissue, embryotic or allantoic fluid and an air pocket, of which at least one object part is to be injected, by advancing injection needles to a determined depth, which depth is expected to correspond with the at least one object part to be injected, into the objects and injecting fluid into the objects at the determined injection depth. The system a sensor to monitor pressure or flow of the fluid during injecting, and to generate a monitoring signal, the control being configured to detect an operational state of the needles and/or the fluid, indicating proper operation or defect in the system, such as a blocked fluid line and/or needle, based on the monitoring signal representing the monitored pressure or flow.
