It is always good to know that you are using a product that you purchased to its full potential. Waste can be costly... It is good procedure after buying a product that the user of that product be well aware of the inner workings of said product. When a full understanding of a newly purchased product is achieved, then the user of that product will be well aware of how to go about taking advantage of the full benefits of that product.
Here, the intent is to make the purchaser of the Brother TN450 fully aware of the features and benefits of using this toner cartridge to its maximum life expectancy.