Here are the caliper heads for comparison. The one on the left is a fake while the one on the right was bought direct from a mitutoyo dealer.

One poster was correct about the width of the line printed at the lower end of the scale, it's thicker on the fake.

The battery cover is also a giveaway, on the fake it is just a cover and on the genuine it has absolute printed into the plastic.

The batteries supplied with the fake are LR44 not SR44 even though the card they come in has mitutoyo printed on it.

The display when in imperial has the caring decimal placing.

The slide locking screw is clumsy compared to the original.

The genuine one weighs 6 grammes more than the fake and you can feel the difference in your hand.

The paperwork is very well copied so don't look too deeply there.

It's like playing those spot the difference games in the paper.

My 20 year old caliper for comparison too. Still works good as new.