details of the part while the trailing digits indicate that the part is like other parts with the same trailing digits thus the buffer reservoir 206 and the buffer reservoir 306 are similar in function and found in fig2 a and fig3 a respectively a fourth embodiment of the multi reservoir load cell assembly 700 shown in fig7 a 7 b employs the same components as the third embodiment however a second load cell 722 is attached to the buffer reservoir 708 the assembly 700 is preferably used with the system of fig8 with the control system of fig3 with additional components for the second load cell the fourth embodiment of the multi reservoir load cell assembly 700 shown in fig7 a b operates much like the second embodiment except that the load cell 712 only measures the chemical in the main reservoir 706 and the load cell 722 only measures the chemical in the buffer reservoir 708 the advantage here is the buffer reservoir 708 is constantly monitored so if the downstream process or tool suddenly consumes large amounts of chemical during a refill cycle the system can stop the refill cycle short to bring chemical into the buffer reservoir 708 from the main reservoir 706 to prevent the complete evacuation of chemical from the buffer reservoir 708 a fifth embodiment of the multi reservoir.