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Laptops screens do not lend themselves well to calibration. They have a very limited gamut and the graphics controller's look-up table (which is used to pull the screen's colour output close enough to acceptable) has a limited bit depth, too. An entry level screen calibration device like a Spyder or even a Huey will do just fine to get you into the right ballpark. If you buy a used older one make sure it explicitly supports LCD screens.
Apart from that, there are pretty good contrast, brightness and RGB gamma test images that can be used to adjust the screen colour and dynamic range, provided the graphics driver provides the necessary knobs to play with.
Using a hardware colorimeter has the added benefit that it lets you create a colour profile for your screen, which colour management aware graphic/photo/video software can use to ensure the best possible colour reproduction on your screen.
Cheers
Steffen.
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