Key Takeaways
- Laser scanners: reliably read label-based 1D barcodes, but struggle to read damaged codes or those on reflective surfaces.
- Image-based barcode scanners: read 1D and 2D codes, direct part marks (DPMs), and damaged codes in challenging settings.
- Light it right: Both technologies need high-contrast conditions to recognize and read the code. Lighting angles and configurations also directly affect code readability.
What are the Main Types of Industrial Barcode Scanners?
Industrial scanners need to keep up with fast product lines, withstand harsh conditions, and perform in challenging settings. Retail scanners simply aren’t up to the task.
Industrial barcode scanners are primarily grouped into two scanning methods; laser- and image-based, and two form factors; fixed-mount and handheld. Understanding the strengths and best-fit applications of each type is essential for choosing the right technology to keep your operations accurate, efficient, and scalable. In this post, we'll break down the main categories of industrial barcode scanners and what makes each one suited to different tasks.
Laser Scanners: Fast Reading for One-Dimensional Codes
Laser scanners use a beam of light to capture the reflective and dark segments of a barcode. Sensors convert that information to an electronic signal and decode it into digital data.
The physics of laser scanners limit their functionality: beams must hit the barcode at a precise angle. Issues like curved surfaces, torn labels, and obscured barcodes prohibit laser scanners from recognizing and reading codes.
Since laser scanners measure the widths of light and dark segments of a barcode, they can only read one-dimensional (1D) barcodes.
Image-Based Scanners: Reliable, Omnidirectional Code Reading
Image-based scanners capture an entire picture of a barcode and use decoding algorithms to extract the data. Since image-based scanners capture the entire code, instead of identifying and measuring bars and spaces, they can read 1D and 2D barcodes at any angle.
An imager also stores the failed image. When a code doesn’t read, you don’t just get a “no‑read” error. You get visual proof, showing the tear, the condensation, or the low‑ink fade that caused the no-read. That single capability strips hours from root‑cause investigations.
More importantly, area imagers with advanced decoding algorithms can recover data from codes that would cause outright failures on a laser scanner: smudged labels, partial tears, print voids, and low-contrast marks. AI-enhanced imaging readers take this further, applying machine learning to reconstruct and decode codes in near-real-time even on the most challenging surfaces.
Image-based scanners read torn, smudged, and other challenging codes.
Image-based scanners read 2D codes that laser scanners can’t.
Laser vs. Imager at a Glance
| Capability | Laser Scanner | 2D Imager |
| Code orientation | Must be aligned with scan line | Omnidirectional, any angle |
| Damaged or low‑contrast codes | High failure rate | Up to 99.9% read rates on damaged, low-contrast codes |
| Symbologies | 1D only (Code 128, UPC, etc.) | 1D, 2D, and stacked symbologies |
| Multiple codes in one frame | No | Yes |
| Onboard no‑read images | No | Yes |
How 1D Barcodes Fall Short
A standard 1D barcode holds a few dozen characters at most, and every scan requires a lookup against an external database to retrieve the associated product information. A 2D code can hold hundreds of characters, including part numbers, serial numbers, expiration dates, lot codes, and URLs.
2D barcodes also incorporate built-in error correction algorithms that allow a reader to reconstruct and decode a code even when portions are obscured or damaged. 1D barcodes have no equivalent capability. On a production line where labels are exposed to oil, abrasion, heat, or mechanical contact, embedded error correction helps prevent misreads and manual intervention.
The Shift from 1D to 2D Barcodes
In healthcare and medical devices, the FDA's Unique Device Identification (UDI) requirements mandate 2D codes (on device packaging and direct part marks (DPMs) on the devices themselves. In pharmaceuticals, serialization regulations follow the same path. Across retail and consumer packaged goods supply chains, the GS1 Sunrise 2027 initiative is driving a broad industry transition from legacy UPC barcodes to 2D formats at every point of sale. Packaging World reported in 2025 that major retailers including Walmart and Wegmans are moving toward requiring 2D barcodes, making scanner readiness a compliance issue.
Expert Insight: What do Most People Overlook when Deploying an Industrial Barcode Scanner?
Amaresh Dash, Sr. Applications Engineer: “The basics: code quality, lighting, and how the scanner is mounted. mage-based scanners are powerful tools, but if a code is missing key elements, like a clear quiet zone or L pattern, the reader won’t recognize the code. Barcode printers can degrade over time, leading to problems like low contrast or missing elements. Both elements, the scanner and the code itself, need to function as intended for successful scanning.
How a scanner is positioned and the angle of the barcode is a common problem we see in the field. If you’re reading a code on a shiny surface, for example, and position the scanner at a 90° angle, the direct light will make the code harder to read. Your lighting setup and position of the scanner are interconnected and have to work together.
Mounting affects the depth of field, too. If your scanner is too close or far away from the code, it will struggle to get a clear, focused image."
Form Factors
Fixed-Mount Readers: Automation and Speed
Like the name implies, fixed‑mount readers are attached to conveyor belts, robotic arms, packaging stations, or other hardware.
They read codes without human intervention and can keep up with high line speeds. These scanners excel where part presentation is repeatable and throughput is non‑negotiable: inbound sortation, automated palletizing, print‑and‑apply label verification, and direct part mark reading on engine blocks.
Key characteristics that matter for fixed‑mount applications:
- Triggered operation: A photoelectric sensor or PLC signal triggers each read, syncing the scanner to the line beat.
- Multi‑reader arrays: Tunnel or surround‑scan setups combine multiple fixed‑mount units to capture codes on any side of a package without turning it.
- Industrial protocols: Direct communication over Ethernet/IP, PROFINET, or IO‑Link eliminates middleware PCs, sending decoded data and diagnostic alerts straight to the PLC or MES.
- Ruggedized enclosures: IP65/IP67 ratings and hardened cabling withstand washdown, vibration, and temperature swings on the plant floor.
When a line stops because a code didn’t read, the stored no-read image from a fixed-mount imager delivers immediate root‑cause evidence, like a torn label or faded code, so engineers can address the problem instead of applying a temporary fix.
Handheld Barcode Scanners: More Mobility
A handheld barcode scanner puts the reader in an operator’s hand. It excels where items arrive in unpredictable orientations, where codes hide on different faces of a bin or tote, or where a worker moves among stations. Common environments include repair benches, incoming inspections, pick‑and‑pack stations, and loading docks.
Critical features that separate industrial handhelds from consumer‑grade devices:
- Ergonomics and durability: Lightweight, balanced designs reduce fatigue across an eight‑hour shift. Rugged housings survive repeated drops onto concrete and operate in dusty or wet conditions.
- Omnidirectional reading: Imagers inside handhelds read any symbology, any orientation, so the operator never rotates a part to align a scan line.
- Wireless connectivity: Wi‑Fi 6 or Bluetooth options untether operators, feeding decoded data directly into a WMS or tablet interface.
Handheld imagers equipped with HDR+ and AI decoding can read codes through shrink wrap, on curved shiny surfaces, or on low‑contrast direct part marks.
Important Features to Look for in an Industrial Barcode Scanner
Expert Insight: How Does Megapixel Count Affect a Scanner’s Performance?
Amaresh Dash, Sr. Applications Engineer: “More megapixels mean a higher resolution, enabling a scanner to read smaller or denser barcodes. But there’s a tradeoff, higher resolution is going to slow down your response time and framerate. Depending on your application requirements, higher megapixels isn’t always worth it.”
Connectivity
Industrial readers must natively communicate with common industrial protocols, like Ethernet/IP, PROFINET, and IO‑Link. This eliminates a vulnerable PC middleware box and shares real‑time diagnostics directly to your control system. When a lens drifts out of focus on a vibrating machine, the PLC can identify the problem before it multiplies.
Autofocus
On a logistics or shipping line, packages are rarely the same dimension. Barcodes on envelopes, mailers, and boxes are positioned at variable locations, so the barcode scanner needs to refocus to find and read codes.
In the context of barcode scanning, autofocus technology automates this process to maximize read rates and streamline operations.
This single difference eliminates multiple operational bottlenecks like changeovers, mechanical degradation, and consistent performance in challenging settings.
High Dynamic Range (HDR) and High Dynamic Range Plus (HDR+)
HDR captures detail in the bright reflections and dark valleys of a shiny aluminum can or a transparent shrink‑wrapped tray. Instead of a washed‑out white glare where the barcode lives, the reader produces a flat, readable image. Without HDR, you start tilting fixtures and adding polarizing filters that slow deployment and break.
HDR+ increases localized contrast, creating a more uniform image in a single acquisition for greater depth of field, faster line speeds, and the ability to read damaged or obscured codes in challenging settings.
Expert Insight: How Do Optics Affect Depth of Field in Image-Based Scanners?
Amaresh Dash, Sr. Applications Engineer: “Optics are usually the biggest factor for depth of field in an image-based scanner. The aperture directly affects how much depth of field you can achieve, and depending on the application, focal length can matter just as much.
If a package with a barcode is moving along a 615 mm-wide conveyor, the code itself can show up anywhere from 143 mm to 350 mm away from the scanner. That's a 207 mm reading window, and the lens's depth of field needs to cover the whole thing. Fall short, and the code falls out of focus at either end of that range, which drags down read rates.
For a reading window in that range, a 25 mm or 35 mm lens with a fixed aperture would be the right call. It gives you the field of view needed to see the full reading area, without sacrificing the depth of field needed to keep the code in focus.
Depth of field is only half the story. The lens you pick also has to deliver enough pixels per module on the code for the decoder to read it. So, choosing optics isn't just about answering "does this hold focus across my range" – it's a trade-off between focus range and resolution, and a lens that nails one but not the other will still cause reading problems."
AI‑Powered Decoding
This is the piece that draws skepticism. AI is not a gimmick when applied to direct part marks. A 2025 report in Vision Systems Design documented that on low‑contrast, dot‑peened 2D codes on metal surfaces, AI‑driven decoding algorithms pushed read rates from 88% to over 99.5% by learning the difference between an intentional peen mark and the material’s natural grain. Traditional edge‑detection fails on that “organic variation.” AI learned it. That shift eliminates manual rescan stations on automotive and electronics lines.
Standards-Based Grading (SBG)
Decoding a code is not enough. A barcode that reads on your line might fail at the retailer’s distribution center, the hospital’s point of use, or the automotive OEM’s inbound dock – triggering costly chargebacks and investigations. SBG is a software key that grades the quality of 1D and 2D barcodes, determining if they are readable by different devices across the supply chain. SBG can help boost manufacturing productivity, throughput, and reliability by providing real-time barcode feedback, grades, and calibration without additional hardware required by the International Standards Organization (ISO).
How Do You Future‑Proof a Barcode Reading Investment Today?
With the GS1 Sunrise 2027 initiative on the horizon, laser scanners have a limited shelf life. Image-based barcode scanners can read both 1D and 2D codes. Other benefits include the ability to store images and analyze no-reads, omnidirectional scanning, and reading damaged, obscured codes in challenging settings.
Build your next scanner specification around the five‑point checklist: connectivity, liquid lens, HDR, AI-powered decoding, and SBG capabilities.