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📐 Elevate your craft with the ultimate combo square—precision that commands respect.
The Johnson Level & Tool 400EM-S is a 12-inch professional-grade metal combination square featuring a CNC-machined cast zinc head for superior accuracy, a stainless steel blade with permanently etched dual inch/metric graduations, and an Auto-Lock blade assembly for precise alignment. Designed for durability and versatility, it includes a built-in level vial and functions as a try square, miter square, marking gauge, and depth gauge, making it an essential tool for millennial professionals who demand reliability and precision on every project.


















| ASIN | B00002N5O9 |
| Best Sellers Rank | #93,045 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #101 in Carpentry Squares |
| Brand | Johnson |
| Brand Name | Johnson |
| Color | Black |
| Customer Reviews | 4.5 out of 5 stars 2,214 Reviews |
| Global Trade Identification Number | 00049448003679, 00049448400003 |
| Graduation Range | 1/32 Inches |
| Item Dimensions L x W | 12"L x 5.5"W |
| Item Thickness | 1 Millimeters |
| Item Type Name | Johnson Level & Tool 400EM-S 12-Inch Metal Combination Square |
| Item Weight | 0.3 Pounds |
| Manufacturer | Johnson Level & Tool |
| Material | Stainless Steel , Zinc |
| Material Type | Stainless Steel, Zinc |
| Model | 400EM-S |
| Part Number | 400EM-S |
| Product Dimensions | 12"L x 5.5"W |
| Style | 420EM Inch/Metric Metal |
| Style Name | 420EM Inch/Metric Metal |
| UPC | 049448003679 049448400003 |
| 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. |
J**A
Love this combination square!
Love that is stainless steel so it won’t corrode in humid Florida, love that the numbers are etched and won’t rub off, love how it’s a very solid hunk off metal and not some plastic Tonka Toy piece of junk, love how it has both inches and metric, and love how my table saw blade is finally square!! And all at a reasonable price. This is the one to have!
G**Z
Really a great value.
I am not a tool snob, but I do like quality tools. I already have a really nice PEC square that is built/rated to very high specifications. I thought I would buy this just to have around when I needed something for measuring lumber (2 X 4 ) without breaking out my really nice square. When I opened the package I was really impressed with the weight of this tool. It does not feel like a cheaply made tool at all. Then I did the test where you take the square - draw a line about the length of the square, then turn it around and duplicate the line. To my surprise this square is every bit as square as my PEC! If you are new to woodworking, I would suggest picking this square up. I am going to treat this tool as if it cost me 100 bucks just because it is so well made. I wish all low cost tools were of this caliber of quality.
S**B
Could be better, but better than any other metric version on Amazon.
I really needed a metric version of this tool and originally all I could find were these horrible green ones that came in Chinese packaging. They were sharp and damaged all over. Compared to those this one is golden. It still seems a little rough around the edges, but is much better quality, and the machining is smooth. There is still the occasional small gouging, but it is finished over and not sharp to the touch. The locking mechanism is very cheap though. It really drives down the quality of this tool. The ruler also has edging issues where it is finished to much casuing the lines to have been worn off.
J**B
As described
Works well. Square seems accurate. I don't use for high precision work so good accuracy for my purposes. I would buy again.
A**N
Good Tool Great Company
I recently purchased the tool and it is square and very good quality. Unfortunately my unit had a slight issue in that the ruler would not hold tight due to the lock nut and spring combination. I contacted the company and they immediately issued an RMA, a shipping slip and promptly returned a brand new unit. I would not hesitate to buy from them again, the fact that they honor their warranty and provide up to date communication along with a good sturdy, quality tool makes them an A+ value brand!
R**.
They work great
Perfect replacement for my broken Stanley square
D**D
Excellent Quality and Value. Made in the USA
I purchased this to replace an old Johnson that had rusted out just hanging in the garage and the square was plastic. I didn’t even realize how much of an upgrade this turned out to be. The ruler is stainless steel, the square is zinc and has a hardened scribe built into it. On top of all that it’s made in the USA. What a pleasant surprise.
F**S
Nice square!
Quality
Trustpilot
1 month ago
2 days ago