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It has always been difficult to compare printer cartridge suppliers. They all used different methods of testing their cartridges, and the specifications from one couldn’t be compared with another.

This has changed in the last couple of years, however. In mid-2004 most of the top ink suppliers started to work under the International Standards Organization’s requirements for testing monochrome inkjet cartridges.

The ISO works to create industry standards that allow consumers to rate and compare competing products in a fair and unbiased manner.

With the ISO standards for printer cartridges, it give the consumer a reliable way of comparing brands and manufacturers of ink. The reported yield from their cartridges are all determined using the same methods, so the numbers are directly comparable.

The standardization by the ISO specified these points:

- Default settings must be used when printing test examples.

- The tests are performed under strict temperature controls

- Both the cartridges and the printers used for testing must be available to the average consumer

- 9 of each cartridge must be tested for statistical validity

- Since a certain printer could unfairly affect test results, three cartridges have to be tested with three different printers.

When considering which ink supplier you want to offer your business to, think about reliability, overall quality, and delivery in addition to numbers produced by testing.

Keeping notes on your own printing results is another way to decide which ink suppliers prove themselves to be deserving of your purchase.