While we have already warned you about extended warranties, you also need to be warned about all of the little extra services companies will try to sell you.

The folks over at Dvice (which also take credit for the picture shown here) are warning their readers about an apparent scam being run by Best Buy.  They will show you two HD televisions shown the same image, and you can clearly see the “calibrated” unit has a much sharper image.  For $300 they will help you “calibrate” your set to get the best image you can.  The problem is that it appears the better image is being shown via an HDMI connection while the poorer picture is being transmitted by either composite cables or other standard definition means.

This is not adefinitive example of the problems with add-ons ervices, but it sure looks like it.  It is, however, another perfect example of how you should research things online.  Go on a search engine, search on “calibrating your HD TV” and you can probably find people telling you how to do it, or if you even need to bother.  And this goes for any and all services that stores might try to sell you.

Remember, stores want to sell you as much as possible, but you always need to ask yourself if you really need what it is their selling you.