# Shelf labels and electronic shelf labels: a store guide > https://rundoo.ai/resources/guides/shelf-labels-and-electronic-shelf-labels/ [Guides](/resources/guides/index.md) /Product Product # Shelf labels and electronic shelf labels: a store guide What belongs on a shelf tag, direct thermal vs thermal transfer printing, how to keep shelf and register prices matched, and when electronic shelf labels pay off. [![Titus Capilnean](https://pub-5247264bd04e4ebeaecbbedb3bebb9f8.r2.dev/static/images/articles/titus-capilnean.jpeg)](https://www.linkedin.com/in/tituscapilnean/) [Titus Capilnean](https://www.linkedin.com/in/tituscapilnean/), Head of Marketing October 27, 2026 Last updated October 27, 2026 A shelf label is the small printed tag on the shelf edge that tells a customer what the item is and what it costs, and tells your staff where it lives and when the tag was printed. Electronic shelf labels (ESLs) do the same job on a battery-powered e-paper screen that updates over the air instead of by reprinting paper. This guide covers what goes on a good tag, how barcode labels, shelf labels, and bin tags differ, which printing method holds up in your store, how to keep shelf prices matched to register prices, and how to decide whether ESLs make sense for a store with tens of thousands of SKUs. ## What goes on a good shelf label A shelf tag has two audiences, and it has to serve both at a glance. The customer standing in the aisle needs to recognize the item and see the price. Your crew needs enough detail to restock, reorder, and spot a stale tag before a customer does. For the customer, print a description in words a customer would use ("Deck Screws #8 x 2-1/2 in, 1 lb box", not an abbreviated vendor string), the price, and the unit of measure. The unit matters more than most stores give it credit for: "per ft", "each", and "per bag" prevent the argument at the counter when someone assumed the rope price was for the whole roll. If your store sells by one unit and buys by another, our guide on [units of measure](/resources/guides/units-of-measure-buy-by-the-roll-sell-by-the-foot/index.md) walks through how to keep that straight. For your staff, the tag should also carry the barcode and SKU, the vendor item number (so the person writing the purchase order can confirm they're ordering the right thing), a bin location, and the date the tag was printed. That printed date is the quiet hero of the whole label. When a customer says "this rang up different", a tag dated fourteen months ago tells you exactly what happened before anyone has to look anything up. ## Shelf labels vs barcode labels vs bin tags These three get lumped together because they come off the same printer, but they do different jobs. | Tag type | Where it lives | What's on it | Main job | | --- | --- | --- | --- | | Shelf label | Shelf edge or price rail | Description, price, unit of measure, barcode, SKU, vendor item number, bin location, date printed | Customer-facing price and item ID | | Barcode label | Stuck on the product itself | Barcode, SKU, sometimes price | Scanning at checkout for items with no manufacturer barcode | | Bin tag | Backroom shelf, pallet, or bin | SKU, description, bin location, on-hand quantity | Stocking and counting | Barcode labels earn their keep on anything that arrives without a scannable code: bulk fasteners you bag yourself, cut goods, cull lumber sold at a discount, feed repacked into smaller sacks. If you're fuzzy on the difference between the SKU you assign and the UPC the manufacturer prints, [SKU vs UPC](/resources/guides/what-is-a-sku-vs-upc/index.md) sorts it out. Bin tags belong in the back room and the yard, and they're what make a [cycle count](/resources/guides/cycle-counting-for-retail-stores/index.md) go fast, because the counter can scan the bin instead of flipping a product over to find the code. ## Printing options: direct thermal vs thermal transfer Almost every store prints tags on a thermal label printer, and the choice that matters is direct thermal versus thermal transfer. Direct thermal burns the image straight into heat-sensitive paper, no ribbon. [Zebra's white paper on label selection](https://www.zebra.com/content/dam/zebra/white-papers/en-us/selecting-right-label-white-paper-en-us.pdf) is blunt about the trade-off: "Direct thermal printing has a shorter life than thermal transfer printing and may fade over time. Direct thermal labels offer minimal resistance to heat, light, abrasion, and chemicals. Exposure to these items will cause the material to darken, resulting in text and barcodes that are unreadable." Zebra's own rule of thumb is that if a label only needs to be readable for six months with no chemicals, moisture, or abrasion, a direct thermal paper label fits the job. Thermal transfer runs the print through a ribbon, and per the same white paper it "works with a wider variety of materials than direct thermal, including paper, polyester, vinyl, polypropylene, and polyimide." For anything facing rain and sun, Zebra's guidance is that "a thermal transfer synthetic material would be the optimal solution." Translated to a supply store: direct thermal paper is fine for indoor shelf labels you'll reprint within months anyway, which is most of the store. Thermal transfer on a synthetic stock is the right call for the lumber yard, the nursery tables, the fence of bagged mulch, and anything near the tint station or the solvents shelf, where a splash of chemicals darkens a direct thermal tag. A faded tag in the garden center isn't a pricing tool, it's a guess. ## The price-accuracy problem, and a worked example the price on the shelf is a promise, and the register is where the promise gets kept or broken. The price verification procedure in [NIST Handbook 130](https://www.nist.gov/document/2026-hb-130-section-v), which state and local weights-and-measures inspectors use, applies to "all retail stores, including food, hardware, general merchandise, drug, automotive supply, convenience, and club or other stores." An overcharge is when "the price charged for an item is more than the lowest advertised, quoted, posted, or marked price." The accuracy standard is 98% on a 100-item sample, meaning "at most two errors are permitted on a 100-item sample." Undercharges don't count as errors if you can show the change was intentional, for example when you lowered the price in your system before updating the shelf tags. How each state and city enforces it varies, so check with your local weights-and-measures office, but the direction is the same everywhere: the shelf and the register have to agree. Now the worked example. Say you sell a 1 lb box of deck screws for $12.40 at an $8.00 cost, which is about a 35% margin. The vendor's price file lands on Monday and the cost on that box rises to $8.80. To hold your 35% margin, the new shelf price is $13.54 ($8.80 divided by 0.65, rounded). If you update the price in your POS but nobody prints the tag, every box that sells this week at the register price of $13.54 is an overcharge against the $12.40 tag in the aisle. (If you're rusty on holding margin through a cost increase, [margin vs markup](/resources/guides/margin-vs-markup-pricing-hardware-store/index.md) has the math.) One box of screws is easy. The problem is scale. That same vendor price file might change 300 items in a week, and 300 items means 300 tags to find, pull, and replace by hand across every aisle, endcap, and clip strip in the store. The fix is boring and it works: make tag reprints a weekly habit. Right after you accept cost updates, print the batch of tags for every item whose price moved, and hang them the same day. Some POS systems will even generate that "prices changed since last print" list for you, which turns a storewide hunt into a pull-list. ## Electronic shelf labels: what they are and how they work An electronic shelf label is, in one ESL maker's words, a "battery-powered IoT device designed to replace traditional paper price tags." Modern ESLs "typically use e-paper displays capable of maintaining screen content without continuous power", so the price stays on the screen between updates without drawing power. The tags talk to your back office through wireless signals via ceiling-mounted access points, and they "only require energy when altering the screen display or communicating" with those access points. On battery life, that same maker puts the industry average for coin-battery ESLs at around 3 to 6 years, with actual life depending on how often you push updates, signal strength, and temperature. An unheated barn or an outdoor yard is a harder place for a battery than a climate-controlled paint room. The mechanics of a price change become: cost file comes in, prices update in the POS, the ESL system pushes the new prices to the tags, and the shelf and register match without anyone touching the shelf. No pull-list, no ladder, no Saturday spent walking aisles with a label gun. Tag, you're not it anymore. ## The honest pros and cons for an independent store **Where ESLs shine.** Stores where prices change constantly get the most back: anything tied to commodity costs, frequent vendor price files, or heavy promotional calendars. Multi-thousand-SKU stores feel the labor savings most, because the weekly tag run scales with your item count. Price accuracy stops depending on whether someone finished the tag run, which matters under the 98% standard above. **Where they pinch.** The hardware cost is real: every tag on every shelf, plus the access points, plus installation. Ask vendors for a per-tag and per-access-point quote and do the math against your actual weekly tag labor before you sign anything. Batteries are a maintenance item across tens of thousands of tags, so plan for a steady trickle of replacements once the fleet ages. The tags have to fit your fixtures, and shelf channels in an old lumber yard were not designed with e-paper in mind. And the whole system only works if your POS connects to the ESL software, so confirm that integration exists, in writing, before the quote stage. Finally, if your prices move a few dozen times a month, you're buying a lot of radio to solve a half hour of label printing. ## Decision checklist: paper tags or ESL Run through these five questions and the answer usually picks itself: 1. **How many prices change in a typical week?** Under a few hundred, paper tags on a weekly habit are cheap and reliable. Thousands a week, the labor math starts favoring ESLs. 2. **How many SKUs carry a shelf tag?** Multiply your per-tag quote by that number, add access points, and compare it to a year of tag-printing labor. 3. **How much of your store is outdoors or harsh?** Lumber yards and nursery tables need synthetic thermal transfer tags regardless, and they're also where ESLs face temperature swings that shorten battery life. 4. **Does your POS connect to the ESL system?** If the answer is no or "on the roadmap", paper wins by default. 5. **Who fixes it?** A printer jam is a five-minute fix. A dead access point is a service call. ## Printing shelf labels with Rundoo Since you are reading this on our site, here is how Rundoo handles the paper side. Rundoo prints product labels from a custom label designer to desktop and mobile label printers, and the Staff app on iPhone or Android prints shelf labels straight from the phone to a connected Zebra mobile printer, so you can walk the aisle, update a cost, place a reorder, and hang the new tag in one trip. For the weekly habit above, Products > Print labels has a "Print N labels with price changes" option with a "Price change since print" filter, so the reprint batch is exactly the tags that moved since your last print run. For Orgill dealers, Rundoo also sends your store's pricing on the EDI purchase order, so the price labels that come back with the shipment are already correct. If ESLs are on your plan, ask any POS vendor, us included, to show you the ESL integration working before you sign. More on the phone side is on the [Staff app page](/product/staff-mobile-app/index.md). Share Topics [Product](/resources/guides/index.md#inventory-and-purchasing) [← All guides](/resources/guides/index.md) ## Frequently asked questions What is an electronic shelf label? An electronic shelf label is a small battery-powered display, usually e-paper, that sits on the shelf edge where a paper price tag would go. It receives price updates wirelessly through ceiling-mounted access points, so the shelf price changes when the price in the store's system changes, with no reprinting. How long do electronic shelf label batteries last? One ESL maker puts the industry average for coin-battery tags at around 3 to 6 years. Actual life depends on how often prices are pushed to the tag, signal strength in the store, and temperature, so cold spaces and frequent price changes shorten it. What should a shelf label include? A description a customer recognizes, the price, the unit of measure (each, per foot, per bag), the barcode and SKU, the vendor item number, a bin location, and the date the tag was printed. The printed date is what lets staff spot a stale tag before a customer does. Do shelf prices have to match register prices? Weights-and-measures inspectors check this. NIST Handbook 130's price verification procedure, which state and local inspectors use, counts an overcharge as charging more than the lowest advertised, quoted, posted, or marked price and sets the accuracy requirement at 98% on a 100-item sample. Enforcement varies by state and locality, so check with yours. Are electronic shelf labels worth it for an independent store? It depends on how often prices change and how many SKUs carry a tag. A store pushing thousands of price changes a week across tens of thousands of items can save real labor, while a store changing a few hundred prices a month is usually better served by paper tags and a weekly reprint habit. Get a per-tag and per-access-point quote and confirm your POS connects to the ESL system before deciding. ## Find out what Rundoo can do for your business Learn how Rundoo can help you save time, money and hassle running your business. [Book a demo](/signup/index.md) ! ## See Rundoo in action [Product ### Tour the platform POS, inventory, payments, and AI for independent supply stores, in one system.](/product/index.md) [Customers ### Read customer stories See how real paint, hardware, farm, garden, and lumber stores run on Rundoo.](/clients/index.md) ## Keep reading [![ABC analysis for inventory: classify every SKU](https://pub-5247264bd04e4ebeaecbbedb3bebb9f8.r2.dev/static/images/articles/abc-analysis-inventory-aisle-photo.jpg) Product ### ABC analysis for inventory: classify every SKU ABC analysis ranks every SKU by annual dollar movement at cost so your counting, reordering, and vendor attention go where the money is, and here is the step-by-step method with a ten-SKU feed and hardware example.](/resources/guides/abc-analysis-inventory/index.md) [![Backorder vs special order vs out of stock](https://pub-5247264bd04e4ebeaecbbedb3bebb9f8.r2.dev/static/images/articles/backorder-vs-special-order-photo.jpg) Product ### Backorder vs special order vs out of stock Out of stock means your shelf is empty, a backorder means the vendor's shelf is empty, and a special order is an item you never stock that you order for one customer, and each one gets a different answer at the counter.](/resources/guides/backorder-vs-special-order/index.md) [![Cubic yard calculator: feet and inches to yards](https://pub-5247264bd04e4ebeaecbbedb3bebb9f8.r2.dev/static/images/articles/cubic-yard-calculator-photo.jpg) Product ### Cubic yard calculator: feet and inches to yards A cubic yard is length times width times depth in feet, divided by 27, so here is a calculator for rectangles, circles, and triangles with depth in inches, three worked examples, the three mistakes that wreck an estimate, and the conversion to cubic meters.](/resources/guides/cubic-yard-calculator/index.md)