DENSO (JAPAN) newly develops spark plugs training manual 2005/2006 which is for end users, mechanics and shops. The book tells you fundamental spark plug components such as center electrode, insulator, housing etc.
Also it tells you how to read and see spark plug types and appearance after use.
It can be downloaded into your computer and can be printed out so that you can know our spark plugs well.
DENSO (JAPAN) developed Iridium Power information is also available in this manual. Iridium power has been boosted in all over the world and 2006 will be too.