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📐 Elevate your drafts—measure like a pro, design like a visionary!
The Mr. Pen 12-inch T Square is a premium drafting tool made from durable carbon steel, featuring dual-sided laser-etched graduations in both inches and centimeters. Designed for architects, engineers, and artists, it combines precision and versatility as a T square, L square, and scale ruler, ensuring flawless measurements and alignment in every project.




| ASIN | B07F1ZFV69 |
| Best Sellers Rank | #24,743 in Office Products ( See Top 100 in Office Products ) #67 in Drafting Tools & Drafting Kits |
| Brand | Mr. Pen |
| Brand Name | Mr. Pen |
| Color | black, white |
| Customer Reviews | 4.6 out of 5 stars 3,580 Reviews |
| Graduation Range | 1/16 Inches |
| Item Dimensions L x W | 12"L x 8"W |
| Item Weight | 1 Grams |
| Manufacturer | Mr. Pen |
| Material | Carbon Steel , Metal |
| Material Type | Carbon Steel, Metal |
| Model | TS12 |
| Part Number | TS12 |
| Product Dimensions | 12"L x 8"W |
| Style | T,L Square,Square,T Square |
| Style Name | T,L Square,Square,T Square |
| UPC | 853126008265 |
A**R
Well made and useful
Love the T Square. It is very useful for lining up my leather and getting the cut where I want it. Also, seems very well built. I will buy again from Mr. Pen.
W**N
Great product and seller!
I rarely ever review anything on Amazon, but this is worthy of a review. Very nice product, would buy again.
J**E
Great for the Price
Getting this T-Square is a solid deal for a cheap price. It does what it's supposed to do by providing 90 angle edges for drawing my architecture plans, sections, and elevations. I normally use a bigger, more expensive, T-Square; I got this T-Square because of it's smaller size that allows me to carry around when I am traveling and unable to go to the studio to work. This T-Square is made out of strong metal, which makes it quite durable, thus allowing it to sustain for a long time. Furthermore, it provides both inch and millimeter measurements, which I found convenient for my drawings. The only minor issue I have with this T-Square is it's thickness, as a thinner edge will make drawing square edges more efficient with better visibility for sophisticated linework. However, the thickness of the T-Square is understandable, as it is made out of sturdy steel, and the thickness doesn't undermine its function. If you are looking for a cheap, small, travel-friendly T-Square, this T-Square is a decent choice.
T**Y
Read specs, otherwise its great
This is a very sturdy metal T Ruler and the measurements are extremely easy to read... black on white. I guess I should have read a bit as I assumed it was a 24" that would run the depth of my art table but that was my error. The one thing I assumed it had, since it has been on all T rulers I have ever used, is a slight lip on the T top cross section allowing you to let it catch on your work station to ensure that your line is perpendicular. Instead it is all one piece of metal. If that is your preference, its a 5 star. I may find that I prefer carefully lining it up with the paper or canvas's edge instead of letting my table's base lip line up my paper/canvase. It does have inches on one side, marked on all edges, and them MM on the other side marked on all edges. It is a fine T Ruler. I hope this helps.
R**E
Awesome T-Square! A Little DIY can make it perfect!
DO THIS FIX TO MAKE THIS SQUARE WAY BETTER! The T-square is very well made and the lines are very accurate. It is made of steel so it is magnetic and strong enough to hold up to cutting. Just two issues with this square, First is that the black on the square is very thick and makes the edges rounded and not feel very good. If you take a sharp razor knife of some kind, prop it up at 90 degrees flat with the edges of the square you can scrape off the black paint. This will reveal the nice and straight steel edges that are now more accurate and can be cut against with a blade. Second is that there is no raised portion along the top to catch onto a frame or other edge so that it can be held straight. This may only be an issue for me and is not the fault of the design of the square, just with how I want to use it. To fix this I got a very square piece of 1/8” acrylic and glued it flat along the bottom of the t section with a couple of 1-2-3 blocks to keep it square so that I can now place the square on an edge and make right angled marks. Since the acrylic is clear I can also flip it to use the metric side and lay the square on flat surfaces. These fixes do take a little work but make this an awesome little square!
A**H
Excellent smaller T-square
Nice, heavy, and sturdy while still being a manageable size if you don't have a huge drafting desk. It's perfectly square and functions beautifully. Doesn't bend or wobble at all. Great value for the price.
W**R
Good solid piece
Nice weight. My biggest wish is tbat there woukd be a stop for butting agai st the edge of the work piece.
S**S
Not a straight edge
This doesn’t have a ridge on it to slide up and down for a straight edge. Unfortunately, my window of return closed. It’s nice and solid. Just not what I’d use it for.
R**B
Perfect for layout of door jambs or window jambs
I love this square because it’s small enough to fit on my pouch hook and it’s great for tight layout of door jambs and window jambs. Recommend for all trades men doing floor layouts.
S**3
Description is WRONG
Description says 1mm increments. It's 2mm increments which is unusual & hard to adjust to when trying to work fast. If you want advice on making a better ruler do this => Count in Centimeters W/1millimeter increments for the etchings.
F**T
Perfect of cards
I purchased this T square to help my make my greetings cards as the one I had broke. Fast delivery and good quality. I would purchase this again if needed. Thank
C**N
Muy buena regla T
Es un regla que superó la calidad que esperaba, es metálica y de una sola pieza por lo qur supongo que será extremadamente durable, incluso es pesada y tiene la medición en centímetros y en pulgadas. Definitivamente es un producto que si recomendaria para un adulto pues incluso es tan fuerte que puede resultar pesada para un niño.
K**P
Great for fab work
Bought this product because I seen another coworker with something very similar. That was just a little bit bigger than this one but overall I’m extremely happy it fits in my toolbox great and it’s great for metal fab layout.
Trustpilot
2 weeks ago
3 weeks ago