Apple offers free engraving facility for your iPad. If you buy your tablet from online Apple store then it provides you this option during the purchase option. Apple also has a gallery of interest engravings which you may use for your iPad.
This service is available free of cost. Apple engraves your iPad before shipping it to you. This service had been around for some time for iPod as well.
This service is especially useful if you are giving the tablet as gift to someone. If you want to get your iPad engraved it may increase the shipping time a bit. You should also note that engraving may decrease the resale value of your device.
The engraving is done using laser and it helps you in customizing your device.
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