I've been looking for a small metal Metric Ruler for a while.
I found one today at Home Depot for $1.97.
Very nice, 6 inches long (150 mm). Comes with a small removable pocket clip.

A small Metric Ruler is useful for measuring things like the lug size for new watch bands or for the case diameter of old watches.

If you want to pick one up, they are in the tool section of the Home Depot store with Yardsticks, Levels, and T-Squares.
Hard to believe you can buy something useful for under $2 these days. Here is a picture of it.

 

A cheap caliper also works well:

 

Anytime I bring any sort of metal measuring device near a watch a scratch seems to always appear.

 

You stay where you are. I just called Child Protective Services. That looks abusive.

 

Plastic and digital work for for me. Precise and much less risk of any scratches vs metal calibers.

 

That looks like a great tool.

 

Bought on Amazon for $10. It also has a probe that comes out to measure depth on the tail end.
https://www.amazon.com/gp/product/B07VSVMWTJ/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

 

Thanks for the link.
I just ordered one. Amazon Prime says it will be delivered on July 3rd.
.

 

Any of you US crew need help with the metric thing we are here to help

 

I’ve had horrible luck with the digital readout on mine. I think you get what you pay for, but I have switched to an old fashioned version with the dial.

 

First you need to check which mm/inch conversion value a denizen of the USA is using. In my days of CAD/CAM software support I needed to check out a customer complaint from the USA that our program was getting dimensions in ft+inches slightly wrong. We stored in mm, converting as required, and it turned out that they were using the old "US Survey Inch" instead of the current 25.4000000mm version for their work, and they were making things big enough for that to make a difference.

 

When NASA Lost a Spacecraft Due to a Metric Math Mistake

https://www.simscale.com/blog/2017/12/nasa-mars-climate-orbiter-metric/

 

We're inching toward using the Metric System some day.

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Readers of the tech website "The Register" have their own set of dimension standards :-

Area (nanoWales - nW)
Force (Norris - No)
Length (linguine - lg)
Temperature (Hilton - Hn)
Volume (grapefruit - gf)
Weight - (Jub - Jb)
Velocity - (Percentage of maximum velocity of sheep in a vacuum)
Money - (Pogba - Pg)

https://www.theregister.com/Design/page/reg-standards-converter.html

Un*x/Linux users can incorporate these into their units(1) data file

The list above is not complete and does not include my favourite, the milliHelen -- the beauty required to launch 1 ship.

 

This is actually the second one I’ve bought. Partially because the first one was metal, but I also had issues with the display / battery not powering the unit after a year or 2.

This new one has been going strong so far, and if I had to shell out $10+tax every year or two for a new one, I wouldn’t mind. This tool lives on my desk and I use it several times a week.

 

I saw what you did there.

 

I have these same calipers. Very happy with them.

 

We officially switched over in 1975.

"The Metric Conversion Act is an Act of Congress that U.S. President Gerald Ford signed into law on December 23, 1975. It declared the metric system "the preferred system of weights and measures for United States trade and commerce", but permitted the use of United States customary units in all activities."