List one method used to measure fuel levels in storage tanks.

Using a dipstick or automatic tank gauge is a widely accepted method for measuring fuel levels in storage tanks. A dipstick is a simple, manual tool that involves inserting a calibrated rod into the tank to determine the fuel level by observing how deep the rod goes into the fuel. This method is straightforward and cost-effective for determining how much fuel is in a tank.

On the other hand, automatic tank gauges provide an electronic method of monitoring the fuel level continually, often offering real-time data and enhanced accuracy. These gauges use pressure sensors or float-driven mechanisms to measure and display fuel levels automatically, making them highly efficient for larger operations or facilities that require constant monitoring.

Both methods are effective for different operational needs; dipsticks are more suited for smaller tanks or less frequent monitoring, while automatic gauges offer convenience for ongoing oversight in larger or more complex fuel storage systems.