Inventory isn't always packaged items; it can be a gas cylinder with a certain max capacity of a particular refrigerant, or a certain capacity/volume of liquid. There can be multiple cylinders of the same material on the truck - 2 cylinders of H2S gas, for example, each with a different capacity, each with a different concentration of gas, etc.

And the same information needs to be tracked at an asset. For example, a specific engine might have a certain capacity of a liquid lubricant or a gaseous refrigerant, for example. Being able to track those levels - current level, target level, etc - can allow customers to automate their processes (IoT alert when level decreases beyond a recommended threshold, for example, to initiate a refill order request).