I don't understand why in the current time considering technology why someone would buy one of these rather than a phone or such device which can run the myriad of apps which do better. I'm not sure what the cheapest option is which has built in compass and level sensing - perhaps an iPod or an android phone of some description. The phone will show you a lot more information in a more user friendly manner and is smaller.
Of course only a few years ago the story was different.
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