I see that Maretron’s DSM150, DSM200, and DSM250 displays have a TLA100 configuration setting called "Tank Capacity:"; what is this?

Maretron’s DSM150, DSM200, and DSM250 displays have a TLA100 configuration setting called "Tank Capacity", which is used to set the amount of fluid that the tank can hold. Subsequent transmissions from the TLA100 can then identify how much fluid the reporting tank can hold.