A barcode scanner turns the bars and squares on a label into data your computer understands. Scanners differ in how they read (the scan engine) and how they are used (the form factor). Choosing the right combination saves time at every billing counter, dock and production line.
By scan engine - how the scanner reads
| Scan engine | Reads | Strengths | Limits |
|---|---|---|---|
| Laser scanner | 1D barcodes | Long reach on 1D codes, familiar red line | Cannot read 2D codes or phone screens; moving parts |
| Linear imager (CCD) | 1D barcodes | No moving parts, durable, reads damaged 1D codes and some screens | No 2D codes; shorter range than laser |
| 2D area imager | 1D and 2D (QR, Data Matrix, PDF417) and screens | Omnidirectional - no need to align the code; reads phone screens and UPI QR codes; can capture images | Slightly higher cost (now the most common choice) |
| Long-range / extended-range imager | 1D and 2D from metres away | Reads pallet and rack labels from the ground or a forklift | Higher cost; for warehouses |
| DPM imager | Direct part marks | Reads dot-peen and laser-etched codes on metal and plastic parts | Specialised for manufacturing and automotive |
By form factor - how the scanner is used
- Handheld corded scanners - the everyday scanner for billing counters and desks, connected by USB.
- Handheld cordless (Bluetooth / radio) scanners - move freely around a shop or store room; the base charges the battery.
- Rugged / industrial handhelds - survive drops, dust and water in warehouses and factories.
- Presentation (hands-free) scanners - sit on the counter; the customer or cashier simply shows the item or phone.
- In-counter and bioptic scanners - built into supermarket checkouts, reading from several angles at once, often with a weighing scale.
- Fixed-mount scanners - mounted over conveyors and production lines to scan automatically, connected to PLCs and software.
- Wearable and ring scanners - worn on the hand or wrist so warehouse pickers keep both hands free.
- Mobile computers (PDAs) - Android devices with a built-in scanner, screen and Wi-Fi/4G, running inventory, picking and delivery apps.
- Pocket / companion scanners - small Bluetooth scanners paired with a phone or tablet for field sales and stock checks.
- Smartphone camera apps - fine for occasional scans; much slower than a dedicated scanner for volume work.
How scanners connect
Most scanners act like a keyboard (USB HID): the scanned data appears wherever the cursor is, so they work with any billing or ERP software without drivers. Others use virtual COM/serial ports, Bluetooth, or Ethernet and industrial protocols for fixed-mount scanners. Mobile computers run apps directly and send data to your system over Wi-Fi or 4G.
How to choose a barcode scanner
- Which codes? Only 1D on your own labels - a linear imager is enough. QR, Data Matrix, GS1 Digital Link, UPI or phone screens - choose a 2D imager.
- Where? Shop counter, warehouse, cold store, factory floor or outdoors - decides rugged rating, cordless range and battery.
- How many scans a day? High volume calls for presentation, in-counter or fixed-mount scanners.
- Distance and label size? Tiny jewellery or electronics labels need high-density scanners; rack labels need long-range imagers.
- Connection? USB, Bluetooth, mobile computer or integration with a conveyor system.
Mindware supplies and services scanners and mobile computers from brands such as Datalogic, Seuic and Zebra - see all barcode scanners and mobile computers. Scanners are covered hands-on in Weeks 7-8 of the Barcode Technology Course.