What is an acceptable method for measuring a tank's contents?

Strapping with a calibrated measuring stick is an acceptable method for measuring a tank's contents because it allows for accurate measurement directly correlated to the physical dimensions of the tank. This method involves determining the liquid level in the tank, converting that measurement along with the tank's specific geometry into volume using calibration data. It is a straightforward approach particularly useful for large tanks where other methods may be impractical.

Other methods have their limitations: using a graduated cylinder is typically suited for laboratory measurements, not for large tanks; digital scales may not accurately account for the tank's dimensions and are best for weighing smaller quantities; and manual volume gauges can be prone to errors due to user interpretation, corrosion, or mechanical failure. Thus, strapping is a more reliable technique in the context of tank measurement.