what is the purpose of the notch on the inside corner? most carpenter/framing squares nowadays have one

Hello Mr. Santoku. One of the reasons that the notch is there, is so that it can act as a pivot point, when trying to lay out or draw arches, curves, or circles. Some people tap a nail in that area, or an awl, or a center punch. To hold it in one location, while doing this type of work. I hope this helps. This one here is of fantastic quality! Others have given some good reasons for it as well here, in answering your question.

Does it have metric units on one side?

No it does not have metric measurements

Is this square as shown in photo,as described and are the measurements accurate?

Yes. This is a simple tool, but a very high quality one. Buy it with confidence. And no, I have nothing to do with the company or any advertising, I just like writing as well as possible, and giving accurate reviews.

As of 9/2021, the label states, "Made in China."

Cs10 | Desertcart UK

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Description

📐 Nail every angle with pro-grade precision and style!

VERSATILE APPLICATION - Perfect for framing, roofing, stairway layouts, and table saw adjustments—your all-in-one right angle solution.
EFFORTLESS READABILITY - EZ Read™ thermal bonded numbers and 1/8" graduations eliminate squinting and speed up your workflow.
ERGONOMIC LIGHTWEIGHT - At just 0.55 lbs, this square is easy to carry and handle without sacrificing strength or precision.
PRECISION MEETS DURABILITY - Forged tip and alloy steel construction ensure long-lasting accuracy on any jobsite.
LOW GLARE ANTI RUST FINISH - Work comfortably in any lighting with a powder-coated surface that resists rust and glare.

The Johnson Level & Tool CS10 is a professional 8" x 12" steel carpenter square featuring rugged alloy steel construction with a low-glare, anti-rust powder coating. It boasts EZ Read™ thermal bonded numbers and 1/8" graduations for clear visibility, making it ideal for framing, roofing, stairway work, and precise table saw adjustments. Lightweight yet durable, this tool is designed to withstand tough jobsite conditions while delivering reliable, accurate measurements.

Specifications

ASIN	B00C7CGM42
Best Sellers Rank	#178,913 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #204 in Carpentry Squares
Brand	Johnson
Brand Name	Johnson
Color	Silver
Customer Reviews	4.7 out of 5 stars 2,075 Reviews
Global Trade Identification Number	00049448270101
Graduation Range	1/16 Inches
Included Components	Square
Item Dimensions L x W	12"L x 8"W
Item Type Name	Vividly Graduated Steel Framing Square
Item Weight	0.55 Pounds
Manufacturer	Johnson Level & Tool
Material	Alloy Steel
Material Type	Alloy Steel
Model	CS10
Part Number	CS10
Product Dimensions	12"L x 8"W
Style	Square
Style Name	Square
UPC	049448270101
Unit Count	1.0 Count
Warranty Description	1 Year Warranty: Johnson Level warrants this product against defects in material and workmanship for one year after the confirmed purchase date. At its option, the company will replace or repair the product if it fails under normal use.

Reviews

M**Y

Great product

I order a metal L shaped ruler 16”x 24” and I love it. It is prefect for measuring my fabric but, the metal and the numbers blend together and it’s hard to see them, (they are etched in & the same color). I decided I would like to order a smaller size (different company) 8” x 12”, now as much as I love the first one, this one is awesome it truly is a professional ruler, this one is actually true steel, heavy weight and the numbers are in bold black so no squinting my eyes to see the number. I am hoping they have the 16x24. Would highly recommend.

10.02.2026

J**S

Quality Carpenters Square!

Accurate, good sized, quality square! The marks dont fade, the engraving is good and the square is easy to use and set up on projects!

28.07.2025

A**S

Good investment heavy to work in carpentry and useful in crafts

I am very satisfied with the quality of this product. I do crafts and wanted an L-ruler of at least 12 ”for the card making craft paper and this has been a success. It is straight, it has no deviation like the one I had before it, it is heavy and gives stability when marking on paper. It looks like a carpentry square. Numbers look good when printed they are not embedded so I'll update my review later if I see something different. It is a good investment for both carpentry or crafts

10.05.2021

C**Y

Great rulers for the price!

I use mine for book binding. They fit against chipboard and cardstock paper nicely and are very accurate. They have a really nice weight to them and make drawing lines super easy. Super easy to read, though with the way I use them, I have to read the numbers upside down. Overall they're fantastic squares, and for only $8 they're really nice quality!

9.05.2024

S**Y

Nice tool

I'm not a carpenter. I bought this for simple jobs, so I can't speak on the 'engineering' of this item. I'm happy. It will do the job!

6.07.2019

C**S

Lifetime tool!

This tool will last a lifetime! No more plastic ones to break! Great quality!

28.08.2025

P**0

Wow!

I was worried after seeing some of the reviews but this thing is STURDY, square and the sticker peeled off no problem. I'll be using it with my cake decorating. The price was amazing!

13.05.2024

N**D

Good tool

It’s a good too. Not a lot you can say other than that

25.08.2025

S**Y

Bon choix.

En acier solide , un indispensable.

18.03.2026

M**A

Muy buena

Muy útil y práctica, solo que para mi es un poco pesada, pero está perfecta.

24.10.2019

P**S

Product Good Amazon’s Packaging Poor

The square is well made and accurate. The plastic bag used by Amazon for packaging appears to be inadequate: it arrived slightly damaged (small dent).

5.06.2024

S**A

Atendeu minha espectativa

Muito grande eu pensando que era uma régua pequena...

16.01.2026

M**2

completely useless

The ruler's borders are full of imperfections which makes it impossible to draw a straight line.

28.02.2022

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