Well, I just purchased 3 of these fake calipers for the price of one genuine when on special (NZ$60ea) using AliExpress. I was sent a message from the supplier before they were shipped and he said that they were made in china but very good product…
So, they turned up today and aside from a few things out of place, it is a very good caliper, not a geniuine mitutoyo, but a good fake. Internet searching has shown 2 distinct types of fake and I seem to have this type **LINK**
It is easily distinguishable by having a small 4th decimal when in Imperial mode. The plastic casing doesn't fit the best and the gib adjuster screws are not central to the plastic casing holes. All 3 had a broken tab on battery cover, apparently another tell tale sign. The certificates had matching serial numbers (all 3 were different) but the rest of the inspection certificate is a straight copy, from the issue number to the errors in readout at set lengths.
I tested these calipers against 2 different micrometers and another caliper all Insize brand. My test piece was a Harold Hall inspired cylindrical square I made, Measuring 24.964 digital mic, 24.97 std mic and 24.97 on the caliper.
The 3 fake Mitutoyo calipers measured the piece at either 24.96 or 24.97 depending which one it was, they repeated their measurement everytime without any numbers dancing, only really hard pressure would cause it to change and they returned to 0.00 every single time. I then performed speed slide test for a long time and yet again it returned to zero every single time, so they might actually be 'absolute' workings. Oh yeah and the slide action is very smooth, but not quite as good as genuine.
I will be checking them against my 25-150mm micrometer standards, and 5mm & 25mm I.D. standards I have at work. That will give a better overall indication.
Conclusion:
While disappointed they are not genuine items, as I kinda knew they wouldn't be. I wanted a set for home, a set for work and the 3rd set was to get a 20% price break and maybe sell to a coworker (with full disclosure). I am happy with the product, happy with the price. Far better than any other made in china caliper I have ever used.
My coworker apprentice has a hand me down genuine mitutoyo digimatic, he was upset to find they were out by a mile (0.2mm per 50mm Jaws still good) when we were comparing things. So even genuine gear needs checking once in a while.