It's 10 p.m. at a busy distribution center, deep into the third shift, and a worker opens a smart locker to grab three freshly charged handhelds for his crew. The system is supposed to instantly know that the worker just pulled all three scanners and update its inventory.
Instead, the scan reads one device pulled, two still present. Now the charging rotation is off, supervisors no longer have an accurate record of where their expensive scanners are, and only that worker knows where the other two “vanished” scanners went.
This one single technical glitch has created a lot of extra work for many people.
On paper, reading multiple RFID-tagged items in one compartment sounds like a straightforward system to design: attach a tag, install a reader, write some code to count the tags. Done.
In practice, it's a genuine engineering challenge. That’s why most smart locker vendors don’t offer multi-read RFID scanning or quietly compromise.
A locker compartment is small and usually metal-lined—two factors that wreak havoc on radio signals. Pack several tagged items into most locker systems and try to scan them with a mass-market RFID scanner, and all you’ll get are dead zones, tag collisions, and signal reflections that cause the reader to double-count one item, miss another, and see something in the compartment next door.
To compensate with the one technology they know, many manufacturers have leaned on UHF RFID, which is best known for its long range and bulk-scanning speed. It’s great for scanning full pallets out on the floor. Not so much a collection of handhelds in a tiny, metal drawer.
RFID scanning in a large, open space is straightforward. But when you take that same technology into the enclosed space of a smart locker, you change the physics of how radio waves operate.
There are three main technical hurdles to making multi-read RFID work in confined spaces:
Because engineering a reliable multi-readable RFID environment is difficult, many locker providers simply say it can’t be done reliably or, at best, provide workarounds that bypass the core engineering challenge rather than solving it, and often at the expense of operating efficiency.
Many providers avoid the complexities of signal collisions by limiting their tracking systems to tracking one item per compartment. You can store a single radio or a single scanner, but not both. If you want tracking on each, you’re forced to purchase and install significantly larger locker banks for more individualized storage.
Some vendors take a budget approach to avoiding this problem and use standard barcode scanners. This method immediately adds friction to your team's workflow. Instead of simply grabbing the necessary equipment and heading to the floor, employees have to scan every individual item manually. If they remember to.
This approach inevitably breaks down due to user error, missed scans, and, eventually, wildly inaccurate inventory records.
Some lockers track only the compartment door. The system logs when a specific user opens and closes a locker and, as part of its workflow, assumes the designated asset was taken or returned during that timeframe. But to state the obvious, tracking a door lock or badge swipe offers no actual proof that an item was taken or returned. If a worker closes the door without returning their device, the system still records a successful return.
You can’t solve the multi-read problem with the industry’s standard engineering approaches. What ecos systems found after a few years of careful, methodical research is that it doesn’t take expensive technology; it just takes some novel engineering using a different type of RFID.
Many standard tracking systems use Ultra-High Frequency (UHF) tags because that technology is readily available and has other industrial applications. But those applications are for high-volume, long-range scanning.
After a decade of research, we’ve found an RFID range much better suited to multi-device reading in lockers. It can do much more targeted scanning at short distances and, with well-designed software, accurately map which tagged devices are in which small compartments.
To overcome physical interference from metal walls, the locker's hardware must be customized to its environment. You also need to position scanners to ensure they perform optimally. Rather than broadcasting a generic signal, you can shape the radio-wave field to reach corners and eliminate blind spots.
Hardware alone can’t solve read collisions. The system also requires dedicated software capable of advanced signal processing. So, for example, when a worker drops a handheld, radio, and spare battery pack in a locker at the end of their shift, the software needs to filter out collision errors, record three simultaneous read events, and send the result directly to the management dashboard.
This can take years of development and testing, something most locker manufacturers may not be prepared to do.
When evaluating smart lockers, you need to verify that the system can handle the real-world complexities of your worksite. To determine if a vendor has solved the multi-readability challenge, run these testing scenarios:
Don’t just accept a standard demo. Request a demonstration that mimics rushed shift changes at your worksite. Have the manufacturer’s rep dump multiple items into the locker in a single pile. Shove items into the corners. If the system drops a tag during these tests, it will likely fail in a live environment.
Place tagged items in adjacent lockers and then check the system's dashboard. Where does it show each item is located? Does it even show both items? If a sidearm in locker A shows up in locker B, the vendor likely hasn’t tuned their antennas or is using long-range RFID tags.
Ask the vendor to explain the engineering behind their product.
A capable provider will have clear, technical answers to these questions.
A smart locker system that struggles with reading multiple items simultaneously creates more operational problems than it solves. To protect your workflows, you want a solution built on precise, intentional engineering rather than standard industry workarounds.
When a smart locker applies subpar scanning, your operations team inevitably deals with phantom inventory issues. Then management must conduct manual audits to locate missing tools and correct the dashboard, undermining automation's purpose. If workers can't rely on the locker to function accurately, the technology becomes an obstacle rather than an asset.
On the other hand, a system backed by proper engineering provides true asset visibility. Operations run smoothly because workers get their equipment without delays or manual scanning. Behind the scenes, management maintains an accurate, real-time inventory that reflects exactly what sits inside every compartment.