To improve effectiveness of inventory control, the tank owner should utilize a tank chart and gauge stick calibrated in what measurement?

Using a gauge stick calibrated to 1/8th inch is the most effective choice for improving inventory control in tank measurement. This level of precision allows for more accurate assessment of the liquid levels in underground storage tanks. An 1/8th inch increment provides a finer resolution than larger increments, which can help in minimizing errors when calculating the volume of liquid remaining in the tank.

Precise measurements are essential in inventory control as they lead to better tracking of inventory levels, optimizing fuel management, and reducing the risks of overfilling or running dry. Moreover, using a calibration standard of 1/8th inch helps in accounting for small changes in liquid volume, which is critical in ensuring that inventory records are reliable and reflect true tank contents.

In practice, this precise measurement aids tank owners in making timely decisions regarding fuel replenishment and serves to enhance overall operational efficiency, helping align supply with demand more accurately.