This is an especially big problem for people buying precision tools. I've been looking at picking up some Mitsutoyo calipers, and the overall consensus is that

This is an especially big problem for people buying precision tools. I've been looking at picking up some Mitsutoyo calipers, and the overall consensus is that if you buy from Amazon, you'll likely end up with a well-executed counterfeit that has all the right markings, but for obvious reasons won't be as precise, nor will it be warrantied or serviced by Mitsutoyo. This is a very real problem. Imagine that you wanted to buy, say, an Omega Seamaster as a special gift. For most people, myself included, three thousand dollars is a ludicrous amount to spend on a wristwatch. Imagine how pissed off you would be to order said watch, have it delivered, give it to your significant other, and then learn a year or two down the road that what you really got was a well-executed fake that could be bought for 1/10 the price.