The Authentic Pocket Engineer - Small Metal Engineering Ruler Protractor Compass Scale, Techie Graduation Gadget Multitool, Mechanical/Civil Engineers Gift, Metric Mini 3 Inch Tool- Genius Lab Gear

This for my twin grandsons who are in college for engineering degrees. They really liked him and said they’ve come in very handy. I think it was a good little gift for the price.

This thing has pretty much all the constants, conversions, and measurements you could ever want. The aluminum (or maybe it's steel (I haven't tested if it is ferromagmetic)) is sturdy, and the sharp edges can even be used to cut packing tape. It's great to put in your wallet and pull out whenever you need Boltzmann's constant.

This basic low-tech gadget has been great for me with the tasks I've needed it for: most-routinely taking small measurements of 3" or less, as an alternative to keeping a bulky tape measure on my belt (or in my pocket), causing my pants to 'droop' and/or my shirt to become untucked. The square corners are of course functional for measuring purposes, but are a risk of pocket-wear, depening on how one stores it. I use my wallet, or keep it in a small stack of other things, in my shirt pocket.I keep it in the included cardboard sleeve, and also in the included inner, clear-plastic sleeve. This is a bit 'fussy' trying to keep track of both the cardboard sleeve and the plastic sleeve, and trying to keep them 'nice'... in my routine tasks, I routinely have dealt with oil-covered metal, so gets a bit messy/problematic, especially when trying to put the card back in all the sleeves, lol.It would be a useful improvement, to have a single, durable plastic sleeve,of course only very slightly larger than the 'measuring-card' itself,i.e. with rounded corners, to improve 'stowability'Either way I like it and it has saved me the trouble of having to carry around a much bulkier tape measure.

I like most things about it, but the protractor was one of the main ones I was interested in it for... and it is one of the worst parts. The design has two weak pieces of metal holding the center part onto the rest of the card, and it easily bends out of place. I'm sure it will also easily break off. And I get that they were trying to make use of as much surface area as possible, but making a larger hole in the center of the protractor (or using a series of overlapping slots) and centering the protractor on the card to move it further from the edges would have made it far sturdier. And it also would have enabled making it larger, which would have made it much more accurate and precise.

I have had so many credit card sized tools over the years and this is my favorite one. All the ones that try to cram in as many tools as possible end up being useless. I use the rulers on this all the time, they are very accurate. I really like the fraction to seminal conversions as well. And all the formulas on the back are great to freshen up on my old college courses. My only question is, who needs 42 digits of pi?

As handy as it gets.

A useful tool for my mechanical engineer.

There are two categories of people: engineers, and those who wish they had the skills to make it through engineering school to become one. Both groups NEED this in their wallet! Sturdy, well organized, and a great combination of data sets and practical tools! Lots of people have wallet tools that can open beer bottles, envelopes, or measure something up to 2 inches. But can your wallet tool measure a pipe's inside diameter up to 1 1/8"? Or quote the speed of light or sound in meters/second? Not to mention (I know - one rarely does in polite society) Boltzmann's AND Planck's constants - both listed here! Stop reading and just buy this now!!