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Product appears to be an ID Tent from Evi-Paq. It has inches on the front 'leg' and cms on the rear.

https://forensicssource.com/collections/evidence-markers/pro...

Scroll down to the lower images. They have both inch and centimeter measurements on other photos.

It's more likely that they take photos with both measurements.

Some gun calibers are measured with inches, so maybe they have some imperial markers on hand to measure bullet casings?

Many measuring devices used in eg Germany have both proper units and Freedom units printed on them. It's probably just easier to have one model that you can sell anyone on the globe. Economics of scale and all that.

I'm Norwegian, and it's very common in Norway as well to have e.g. rulers and other measuring devices with both inches and metric units. It's if anything pretty rare to have just one or the other unless it's a "format" where displaying both affect usability - e.g. make the writing too small.

Odd indeed. I would assume the salvage company was American?

The bottom image has an evidence marker with cms on it as well.

Perhaps they intended for the information to be shared with US intelligence.