---
product_id: 369344472
title: "Johnson Level & Tool 420EM Professional Inch/Metric Combination Square, 16\", Silver, 1 Square"
brand: "johnson"
price: "€ 29.43"
currency: EUR
in_stock: true
reviews_count: 5
category: "Johnson"
url: https://www.desertcart.gr/products/369344472-johnson-level-and-tool-420em-professional-inch-metric-combination-square
store_origin: GR
region: Greece
---

# CNC-machined precision Auto-Lock blade assembly Chip-resistant zinc head Johnson Level & Tool 420EM Professional Inch/Metric Combination Square, 16", Silver, 1 Square

**Brand:** johnson
**Price:** € 29.43
**Availability:** ✅ In Stock

## Summary

> 📐 Elevate your craft with precision that commands respect.

## Quick Answers

- **What is this?** Johnson Level & Tool 420EM Professional Inch/Metric Combination Square, 16", Silver, 1 Square by johnson
- **How much does it cost?** € 29.43 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/369344472-johnson-level-and-tool-420em-professional-inch-metric-combination-square)

## Best For

- johnson enthusiasts

## Why This Product

- Trusted johnson brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Multi-Tool Marvel:** Functions as a machinist’s square, try square, miter square, marking gauge, and depth gauge — your all-in-one precision partner.
- • **Dual-Scale Mastery:** Permanent English & metric graduations in 1/8", 1/16", 1/32" for versatile, fade-proof readability.
- • **Precision Perfected:** CNC-machined square head ensures flawless 90° angles every time.
- • **Lock & Load Accuracy:** Auto-Lock blade assembly guarantees stable, exact measurements without slip.
- • **Built to Brave the Jobsite:** Heavy-duty cast zinc head with chip-resistant e-coating and reinforced scriber for unmatched durability.

## Overview

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 reliable accuracy and durability for demanding construction and machining tasks.

## Description

Little tool, big results. Johnson's easy to use 12" metal combination square gives you the accuracy and precision you need for every job. Its stainless steel blade has english graduations of 1/8", 1/16" and 1/32" as well as metric graduations that are permanently etched in black for easy readability. It features a durable acrylic vial, heavy-duty cast zinc head with a black, chip-resistant e-coating finish, and hardened screw-in scriber that won't fall out so that this combo square can withstand even the roughest job site abuse. It was also designed with maximum accuracy in mind - its square head is CNC machined for greater accuracy, and the Auto-Lock™ blade assembly makes it easier to accurately line up your tool for use.

Review: Excelente producto. Resistente
Review: 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.

## Features

- COMBO SQUARE: The square head of this Johnson metal square ruler is CNC machined for enhanced precision. Its Auto-Lock blade assembly makes it easy to accurately align tools for usage. It gives the accuracy and precision needed for every job.
- STAINLESS BLADE: This combination square tool has a stainless steel blade with English and metric graduations of 1/8", 1/16", and 1/32", as well as metric graduations that are permanently imprinted, so they will never fade or degrade.
- CAST ZINC HEAD: The durable acrylic vial, heavy-duty cast zinc head with a chip-resistant e-coating finish, and reinforced screw-in scriber that won't fall out make this square withstand even the worst construction site usage.
- APPLICATIONS: The CNC-machined head of the measuring tool acts as a stop, ensuring layout lines are always square to the edges. This makes it an ideal machinist's square, straightedge, adjustable try square, miter square, marking gauge, and depth gauge.
- PRODUCT SPECIFICATIONS: This 12’’ combination square measures 0.75 × 5.5 × 12 inches and weighs 4.8 ounces (0.18 kg). This Johnson Level tool is designed and manufactured with precision in the United States.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00002N5O9 |
| ASIN  | B00002N5O9 |
| Batteries Included? | No |
| Batteries Required? | No |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,918) |
| Customer reviews | 4.4 4.4 out of 5 stars (1,918) |
| Date First Available | 15 September 2023 |
| Date First Available  | 15 September 2023 |
| Is Discontinued By Manufacturer  | Yes |
| Item Package Quantity | 1 |
| Item Weight | 136 g |
| Item model number | 400EM-S |
| Item model number  | 400EM-S |
| Manufacturer | Johnson Level & Tool |
| Manufacturer  | Johnson Level & Tool |
| Material | Alloy Steel |
| Measurement System | Inch |
| Part number | 400EM-S |
| Product Dimensions | 1.91 x 13.97 x 30.48 cm; 136.08 g |
| Product Dimensions  | 1.91 x 13.97 x 30.48 cm; 136.08 g |
| Size | Metal Combination Square |
| Style | Metal Combination Square |

## Product Details

- **Brand:** Johnson
- **Colour:** Black
- **Graduation range:** 1/32 Inches
- **Material:** Alloy Steel
- **Style:** Metal Combination Square

## Images

![Johnson Level & Tool 420EM Professional Inch/Metric Combination Square, 16", Silver, 1 Square - Image 1](https://m.media-amazon.com/images/I/21jcpu0oRkL.jpg)
![Johnson Level & Tool 420EM Professional Inch/Metric Combination Square, 16", Silver, 1 Square - Image 2](https://m.media-amazon.com/images/I/41rE77z4gEL.jpg)
![Johnson Level & Tool 420EM Professional Inch/Metric Combination Square, 16", Silver, 1 Square - Image 3](https://m.media-amazon.com/images/I/51C3F6pxAaL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by J***S on 12 July 2020*

Excelente producto. Resistente

### ⭐ Review
*by K***A on 2 March 2023*

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.

### ⭐ Review
*by E***T on 22 April 2024*

Hard to read scale on a thin, flimsy and toyish steel rule. Do not buy.

## Frequently Bought Together

- Johnson Level & Tool 400EM-S Heavy Duty Professional Inch/Metric Metal Combination Square, 12", Silver, 1 Square
- Johnson Level & Tool 406EM Professional Inch/Metric Combination Square, 6", Silver, 1 Square
- IRWIN Tools Combination Square, Metal-Body, 6-Inch (1794468), Blue

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-01-24*