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I have a small keychain laser measurer that I originally bought to use when calculating focal distance with manual camera lenses.
But I find I'm often whipping it out to randomly check how far away I am from random things.
It's oddly very fun.
I lied....in my brain it feels smaller than it is because ive gotten used to it. But now that I actively look at it again, "keychain" sized is a bit of a stretch.
Although I do use it on my keychain, so maybe ive just gotten accustomed to it.

Mine is like three times that size so I would call it Keychain sized too haha
Once I manage to stop hitting the snooze button and crawl my lazy ass out of bed I'll take a photo of it. I bought mine at Canadian Tire. Should be similar in any hardware stores.
I did the same thing lol trying to learn how to hyperfocus, now i keep it at work in my tray of knick knacks and every time someone sees it they start measuring and guessing and don't believe things are certain distances
Adam Savage has a tattoo for that.

Calibrating that thing is a pain.
He's said that even years later it has held up remarkably well. Obviously not millimetre precision, but enough to measure bolt sizes and such.
Edit: I know you said it tongue in cheek, but just an FYI for anyone curious
9 inches! Ialreadymeasuredyoudonthavetocheck...
I did the reverse. I went into the hardware store to buy some chain. As it has to be cut, it is not self-service, I told the Lady that I need this much chain and held my hands apart, and added "50cm". She said "Hold it", took her tape, and measured the distance between my palms. It was exactly 50cm.
Same at the butchers. "I take that piece, it should be 800g." Scale: 802g
If the ability to measure with millimetre accuracy without tools were a superpower, there would be two types of people: those who’d hardly notice it, and those for whom it would be life-changing.
Were you really good at the bookfair games where you win a prize for guessing how many marbles are in a jar
Whether software, electrical, aerospace, or civil… engineer gonna engineer.
The great thing about carrying a purse is that I can have a tape measure and small flashlight wherever i am. and a mushed up granola bar "for emergencies." and so on. can never find a damn pen, though.
You'll get good at estimating lengths fast doing that, the feedback loop works. Do the same thing with scales for weights. Do the same thing with wrist watch/timer for durations. Pretty soon you get a nickname from your wife 'master of time and space'
My hands are exactly 6 inches long from the base of the palm to the tip of my middle finger. I use them to measure things all the time. Very handy.
I’m a carpenter. We love to do that too.
I have a tiny 3ft tape measure on my keychain for similar reasons. It's so handy!
That does actually sound like it would be neat to do. I don't understand why ... but it does.
A man with a good sense of scale.
Pleb, all of the real metrologists like me measure their forearms and fingers to use as measuring devices. Bonus if your forearm is an actual cubit.
Make sure you use class 1 measure tape because you might be right but the device you're using is not precise.
I worked for a bit as a high end roofer (USA), this is the first I'm hearing about different classes of measuring tape. We always used Stanley fatmax tapes, and so did just about every carpenter we worked with. I wonder how accurate that tape is?
I assume it was pretty accurate because we would always fuck with the new guys when they drew a cut line and asked what side of the line your supposed to cut from.
Stanley doesnt have class 1 measuring tapes, theyre all class 2
Class 2 is enough for a roofer.
A metal worker or machinist might require that extra bit of accuracy.
But generally, everyone that claims they're a professional should get a class 1, even if class 2 is accurate enough for most work.
I carry a rolled up 1m paper tape from IKEA as well as miniature plastic vernier caliper in my purse! They are super handy and lightweight, highly recommended.
If you realllly get into it. Or if you're into plant ID: you can tattoo a little ruler onto your hand. e.g., along your index finger. Makes it easy to get pictures of plants to scale. The tattoo will eventually get a little inaccurate, but still seems like a good point of reference.
I have a leather bracelet that is a measuring tape when I remove it. Super handy.
It has gone out of whack by about a 16th of an inch over the last 5 years, but still very helpful for measurement that don't need a lot of accuracy.
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