



📐 Elevate your craft with precision that commands respect.
The Johnson Level & Tool 420EM is a 12-inch professional-grade combination square featuring a CNC-machined stainless steel blade with permanent dual graduations, an Auto-Lock blade assembly for secure measurements, and a rugged cast zinc head with chip-resistant finish. Designed in the USA, it delivers unmatched accuracy and durability for demanding construction and machining tasks.


















| ASIN | B00002N5O9 |
| ASIN | B00002N5O9 |
| Brand Name | Johnson |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,923) |
| Customer reviews | 4.4 4.4 out of 5 stars (1,923) |
| Date First Available | 15 September 2023 |
| Global Trade Identification Number | 00049448003679, 00049448400003 |
| Graduation Range | 1/32 Inches |
| Is Discontinued By Manufacturer | Yes |
| Item Dimensions L x W | 30.5L x 14W centimeters |
| Item Type Name | Johnson Level & Tool 400EM-S 12-Inch Metal Combination Square |
| Item Weight | 0.3 Pounds |
| Item model number | 400EM-S |
| Manufacturer | Johnson Level & Tool |
| Manufacturer | Johnson Level & Tool |
| Material Type | Alloy Steel |
| Model | 400EM-S |
| Part Number | 400EM-S |
| Product Dimensions | 1.91 x 13.97 x 30.48 cm; 136.08 g |
| Style Name | Metal Combination Square |
| UPC | 049448003679 049448400003 |
J**S
Excelente producto. Resistente
P**T
Elle est juste et droite
K**A
Not sure if I receive a dud but I went to use it once and dropped it on a wooden floor from about 1m high and the little metal nub that runs along the groove snapped off instantly rendering it useless. That said I just use the rule by itself so not completely useless. Expected better from a "heavy duty" product at this price.
E**T
Hard to read scale on a thin, flimsy and toyish steel rule. Do not buy.
J**A
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!
Trustpilot
3 weeks ago
1 month ago