Balcrank Multi-Tank Software Interface enables the user to connect up to eight (8) Tank Guardian level gauges, saving historical tank level records according to time interval, level change, and volume change. With the recorded data, a diagram can be displayed showing the historical tank level records, and high- and low-level prompts are included in the display. Note: Freight charges for this product will be calculated after order is placed, and we will contact you with the amount. Please call if freight quote is desired before ordering.