Abstract: End effector assemblies according to the present disclosure include a tool body mounted to a robotic arm and an impedance-measuring tip coupled to the tool body. The impedance-measuring tip defines a first volume to receive a fluid and a first dispensing outlet for dispensing the fluid. The impedance-measuring tip includes an impedance-measuring sensor configured to output a signal indicative of a change in impedance. A tip extension is fluidically coupled to the impedance-measuring tip that defines a second volume for receiving the fluid. A camera is coupled to the tool body and configured to capture image data of the second volume that captures at least a visual representation of a number of cells or other objects in the second volume. A pump is coupled to the impedance-measuring tip to dispense the fluid from the first volume into the second volume and from the second volume into a receptacle.