Have You Ever Noticed What That Black Diamond On Your Measuring Tape Means?


Most of you should (hopefully) know how to use a measuring tape by now.

It’s a handy thing to know and it’s pretty simple too.

All you have to do is pull the tape out and hold it to what you’re wanting to measure.

It’s so easy a child can do it!

But while the use of it can be pretty simple, measuring tapes can have little signs on them, and it’s confusing as hell sometimes.

Honestly, I don’t even know what most of them mean!

It’s like trying to crack the Da Vinci Code.

There are a bunch of hidden meanings on your measuring tape, but thankfully for you Aunty is here to help decode them!

1. Black Diamonds

I know what you’re probably thinking. ‘Aunty Acid, what the hell does that black diamond on my tape measure mean?’

Well, it’s actually quite simple. It’s not really meant for people looking to measure their soon to be sofa in IKEA, it’s actually meant for people in construction.

Most people are quite confused as to what the black diamonds are for.

The black diamonds are actually studded or joist marks. True, they don’t feature on all tapes, but these stud marks frequently appear at 16″ intervals and joist marks at 19.2″ intervals, which is the common interval for boarding. That’s handy to know!

2. Roman Numerals 

When you pull out the blade of the case you’ll notice a Roman numeral within a circle or a rectangle (this differs from tape to tape), and it’s usually printed in red or black.

This number actually refers to the accuracy of the tape.




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