Weigh-and-label scales for small food producers: setting up variable weight, dates and barcodes

Many small food units start by weighing packs on a counter scale and writing the weight and date with a marker. That works at a weekly market. It stops working the day a supermarket or a distributor asks for a printed label with a barcode on every pack.

A weigh-and-label scale fixes this. It weighs the pack, takes off the weight of the container, and prints a label with the net weight, the dates, the batch, the price and a barcode, one pack at a time.

Buying the scale is the easy part.

Setting it up so that every label is legal and every barcode scans is where the mistakes happen. So let us go through it in the order I would do it on a new packing table.

The short version first. Use a scale stamped by Legal Metrology. Pre-print everything that never changes on the label roll, and let the scale print only what changes: net weight, dates, batch, price and barcode. Set the tare for each product, set the date to DD/MM/YY, and ask your buyer which barcode they scan. Then test a full day of labels before the first real batch.

A word on who is writing. At Jagannath Polymers we make packaging, and our sister company, Jagannath Labels, prints labels. We do not make or sell scales, so I will not name a brand. I am also not a Legal Metrology or FSSAI consultant. I have given the source for every rule below, so you and your consultant can check my reading.

Questions to ask before you buy

We have two common setups to choose from. One is a label-printing scale, with the platform, keypad, product memory and a small label printer in one machine. The other is a stamped scale connected to a computer and a separate label printer. The first is simpler on a busy packing table. The second gives more freedom in label design.

Either way, I would put these six questions to the dealer in writing.

1. Can it store each product with its own preset tare, shelf life in days, price per kg and label layout? Most scales call each stored product a PLU.
2. Can it print the date as DD/MM/YY?
3. Can it print the barcode your buyer wants, including GS1 DataBar Expanded?
4. Does it print direct thermal, thermal transfer, or both?
5. How tall is the smallest digit it prints, and what label widths does it take?
6. Does it come with a model approval number and a stamping certificate?

Does the scale need stamping?

Yes. In India a scale that decides how much a customer pays for is a legal instrument, not a kitchen tool.

It starts with the model. Section 22 of the Legal Metrology Act, 2009 asks every maker or importer of a weight or measure to get its model approved. The certificates are public on the Legal Metrology Model Approval System, searchable by year and company. Ask the dealer for the certificate number and look it up yourself.

Then the scale itself must be verified and stamped. Rule 27 of the Legal Metrology (General) Rules, 2011, as amended on 3 March 2021, says every weight or measure used in a transaction is verified and stamped, and then re-verified and stamped at periodic intervals in the state where it is used. The Department of Consumer Affairs keeps the rules and every amendment on its Legal Metrology page.

The same 2021 amendment excuses instruments that industries use only internally, when they do not affect the quantity delivered to consumers. A label scale does the opposite. It decides the quantity your customer receives.

How often? Rule 27(2), last changed on 18 December 2025, gives 24 months for weights, capacity and length measures, tapes, beam scales, counter machines and fuel dispensers (Seventh Amendment Rules, 2025). Storage tanks get 60 months, and everything else falls in the twelve-month group, as the Legal Metrology office in Assam sets out.

An electronic label scale is not on the 24-month list. So I would plan for a yearly stamping and confirm the due date with your local office.

If the scale is repaired, opened or shifted to a new site, ask the dealer or the office about re-verification before you weigh packs on it again.

One more registration surprises small units. Rule 27 of the Legal Metrology (Packaged Commodities) Rules, 2011 asks anyone who pre-packs a commodity for sale to apply for registration within ninety days of starting. Under the Third Amendment Rules, 2026, dated 29 May 2026, the certificate stays valid until cancelled, and the business updates its details on the online portal every year.

Which fields are fixed, and which come from the scale?

Think of a wedding card. The card is printed once for every guest, and only the name on the envelope changes.

I like this picture because a food label works best the same way.

The FSSAI Labelling and Display Regulations, 2020 (consolidated text, Version VIII, 9 September 2025) list what a packed food label carries in regulation 5. Here is how I would split it between the roll and the scale.

The colour point catches people. Regulation 5(4) wants the veg mark as a green filled circle inside a square with a green outline, and the non-veg mark in brown. A direct thermal print, or a black ribbon, can only print black.

So the coloured mark has to be pre-printed on the label roll, with a blank window left where the scale prints.

Give your label printer the exact size and position of that window from the scale's layout. If the two do not match, the scale prints over your logo.

Net weight and tare: the food only

When we print a weight on a pack, we are declaring the food only. The Legal Metrology (Packaged Commodities) Rules define net quantity as the quantity in the package excluding the packaging or wrapper, and rule 11(1) repeats that wrappers and other materials are left out. The rules also allow only SI units, so the label says g or kg.

Every kirana shop knows the trick. The shopkeeper puts the empty steel dabba on the scale and presses zero before filling it. A label scale does the same with a preset tare stored against each product.

This is how I would set it.

1. Take 10 empty containers of the exact type, with lid, film, liner or absorbent pad. Include the label if it goes on before weighing.
2. Weigh them one by one and note the lightest and the heaviest.
3. If they are close, store the average as the preset tare for that product.
4. If they vary a lot, store a tare nearer the heaviest. Any error then falls in the customer's favour.
5. Repeat whenever the container, the lid or the film changes.

Then check the size of the printed weight. FSSAI regulation 6 hands the size of the numbers for net weight, price and dates on the main panel to the Legal Metrology rules. Since the 2017 amendment (G.S.R. 629(E), 23 June 2017), their rule 7 ties the minimum height of numerals and letters to the area of the principal display panel.

Measure the panel of the pack, not the label. If the front panel is 150 cm², every digit of the weight must be at least 2.5 mm tall, and a scale's smallest font may not reach it.

A ruler settles it.

Dates: which ones, and in what format?

Regulation 5(10)(a) asks for the date of manufacture or packaging, and the expiry or use by date. Best before is optional, an extra line if you want it. The dates must sit together at one place on the label (5(10)(e)).

The format is in 5(10)(b). Food with a shelf life of up to 3 months gets day, month and year as DD/MM/YY. Longer shelf life can show month and year only, with the month in capital letters if you write it in letters, such as OCT 2026. DD/MM/YY is allowed there as well.

Now let us bring in the scale. Its clock knows one thing: the day you pack.

FSSAI defines the two dates separately. The date of manufacture is when the food becomes the product, and the date of packaging is when it goes into the container it will be sold in. If you cook on Monday and pack on Tuesday, a scale left on default prints Tuesday. Either call that line "Packed on", or key in the cooking date.

The use by date needs the same care. The scale adds the shelf life you stored to the date it prints. If your 5-day shelf life was worked out from cooking, a pack labelled the next morning should get 4 days in the scale's memory, not 5.

For food with a shelf life of 7 days or less, regulation 8(3) lets the manufacturing date be left out, but the use by date must stay. I would print both anyway, because it costs nothing on a scale label. FSSAI amends these regulations from time to time, so check the latest consolidated version on its website before you order a new batch of label rolls.

Two settings go wrong often.

1. Month first. Some scales and label programs arrive set for other markets. Print a test label on any day after the 12th. On 25 October, 25/10/26 is right, and 10/25/26 means the scale is set month first.
2. The clock. Check it against your phone every morning. A scale that loses its time after a power cut prints a wrong date on every pack after it.

The batch number is the last date-like field, and regulation 5(9) makes it mandatory. Our lesson on batch and lot traceability gives a numbering scheme built from the date, line and shift. If your scale can build the batch from the date, set it once. If not, change it at the start of each run.

Price lines: MRP and unit sale price

If the label carries a price, FSSAI 5(8) sends us to the Legal Metrology rules again.

Rule 6(1)(e) asks for the retail sale price, the MRP, in Indian currency and inclusive of all taxes. Rule 6(11), added by the 2022 amendment and in force since 1 January 2024, also asks for a unit sale price, rounded to two decimals. It is rupees per gram for a pack under 1 kg, and rupees per kilogram for a pack over 1 kg.

Most scales think in rupees per kg. For a 450 g pack the rule wants rupees per gram, so check what your template prints before the first run.

Which barcode goes on a variable weight pack?

A pack that always weighs the same, say a tub filled to exactly 250 g, does not need a weighing barcode at all. It takes a normal EAN-13 with its own GTIN from GS1 India, as our lesson on GS1 barcodes in India explains. The scale only checks the fill.

A pack whose weight changes every time needs the weight inside the barcode, or the billing counter cannot charge for it. The GS1 General Specifications (Release 26.0, January 2026, section 2.1.12) allow two ways.

1. An in-store code. The number starts with GS1 prefix 02 or 20 to 29 and sits in an ordinary EAN-13, with an item code and the weight or price in the remaining digits. GS1 calls these Restricted Circulation Numbers. Each country's GS1 office chooses the layout, the item code is usually given by the retailer that scans it, and the number means nothing outside that area.
2. Your own GTIN plus the weight. The barcode carries your GTIN under AI (01) and the net weight under AI (3103), which is kilograms with three decimals. It can also carry a packing date (13), a use by date (17), a best before date (15) or the batch (10). GS1 names GS1 DataBar Expanded, or its stacked version, as the barcode, and allows 2D codes alongside it during a transition.

The GTIN route keeps the number yours, whichever buyer you supply, though the buyer's counter must still read GS1 DataBar. GS1 itself says the retailer decides what goes on a variable weight label, so your preference counts for little here.

Ask the buyer which code they scan before you set up the scale. If I were in your place and the buyer had no preference, I would take the GTIN route. The number then belongs to my brand, not to one shop's billing system.

Three traps are worth knowing.

1. The decimals. Under AI (3103), a 452 g pack is written as 000452, i.e. 0.452 kg. Set to (3102) by mistake, the same digits mean 4.52 kg, and the counter reads ten times the real weight.
2. Dates inside a GS1 barcode are year first, YYMMDD. 22 October 2026 is 261022. That is correct inside the barcode even though the printed date on the same label reads 22/10/26, so tell your staff before somebody "fixes" it.
3. A GTIN-14 that starts with 9 is GS1's number for variable weight goods moving through warehouses. GS1 says it is not used on items crossing a retail counter, so keep it off consumer packs.

Label stock that lasts until the use by date

Many label-printing scales print direct thermal, with no ribbon. That is fine for a pack eaten within days and kept cool and dry. It is a risk for namkeen on a sunny shelf for three months, or a pickle jar handled with oily fingers.

FSSAI regulation 4(7) asks for label contents that are indelible and readily legible, and 4(6) asks for a label that will not separate from the container. So we choose the label for the shelf life, not for the scale. I would not trust plain direct thermal paper on any pack that stays on a shelf for months.

Our lessons on direct thermal or thermal transfer and on label adhesives go into the materials. For chilled packs, the adhesive must suit the temperature at which the label goes on.

Test a full day of labels before the first run

We should do this before the first real batch, not after the first complaint. It takes one morning.

1. Check the stamp, the certificate, and the model approval number on the portal.
2. Zero the empty platform. Place a known weight of 500 g or 1 kg and read the display.
3. Call up each product and place its empty container. The net reading should be zero or very close.
4. Fill a pack and print. Then weigh the food alone on a zeroed scale and compare it with the label.
5. Check the date line on a day after the 12th, and check one product whose shelf life crosses a month end.
6. Measure the smallest digit of the net weight with a ruler against the table above.
7. Scan the barcode with the kind of scanner your buyer uses, or with a phone app that shows the decoded data. The weight in the barcode must match the printed weight, decimal and all.
8. Keep a few labelled packs where they will live: the fridge, the freezer, the display shelf. Rub one with an oily thumb. Read and scan them again after 7 days.
9. Show one finished label to your FSSAI or Legal Metrology consultant before you order pre-printed rolls in bulk.

After that, a two-minute routine each morning is enough: zero, test weight, clock, and a look at the first label.

Common mistakes

These are the ones I would look for first on any new packing line.

1. Tare not set, or set for a different container. Every label then counts the box as food.
2. Dates printed month first, or a wrong clock after a power cut.
3. Shelf life counted from packing when it was worked out from cooking.
4. Direct thermal labels that fade or smudge before the use by date.
5. A barcode the buyer's counter cannot read, or a weight with the decimal in the wrong place.
6. A veg mark printed in black by the scale instead of pre-printed in green.
7. Weight digits below the minimum height for the pack's panel.
8. A repaired scale put back to work without asking about re-verification.

A scale prints a wrong label exactly as fast as a right one.

That is why I would test first, every time.

Jagannath Labels, our group's label company, prints labels. If you are planning pre-printed rolls for a scale, send us your scale model, the label size, the barcode your buyer wants and a photo of your pack through the contact page. We will tell you honestly whether it is a job for us.