Bluetooth needs a phone in the room. Wi-Fi needs a router in the building. Pick by who must see the weight.
That one line settles most of the Bluetooth vs WiFi weighing scale question. This guide fills in the rest: how far each radio reaches, whether a phone has to be present, what happens when the internet drops, what each one costs as a factory-fitted add-on (indicative ₹4,500 against ₹6,500, before GST, fitted on a new scale) and a decision table by use case. Both radios are licence-free in India. Both are built into Hindustan Scale Company’s connected scales. They are not rivals; they answer two different questions.
Two radios, one band, two different jobs
Bluetooth and Wi-Fi use the same slice of the airwaves: 2.4 to 2.4835 GHz. India de-licensed that band on 28/01/2005 (Gazette notification GSR 45(E)), so a factory needs no wireless licence to run either kind of scale, provided the equipment stays inside the notified indoor limit of 200 mW and shares the band with everyone else. A scale’s radio runs at a small fraction of that limit. The equipment itself still needs a WPC type approval, granted since 2019 by self-declaration on the Saral Sanchar portal — ask any supplier whether the radio in the scale holds one.
Bluetooth is a point-to-point link. The scale talks directly to one phone, tablet or computer. The Bluetooth SIG, which maintains the standard, calls this one-to-one topology; the consequence is that the device receiving the weight must itself be within radio range of the scale.
Wi-Fi is an infrastructure network. The scale joins an access point — the router — which bridges it to the wired network and the internet. A 2016 study in the International Journal of Wireless & Mobile Networks puts it plainly: a station must associate with an access point before it can send or receive anything. The phone that reads the weight can then be anywhere, because it is reading from a server, not from the scale.
So the question is never “which radio is better”. It is: who must see the weight, and where are they standing?
How far does each one reach?
Bluetooth range is not one fixed number. The Bluetooth SIG says reliable range runs from more than a kilometre down to less than a metre, depending on transmit power, receiver sensitivity, the antenna and what stands in the way. A 2025 review in the journal Sensors gives the power classes: 100 mW reaches about 100 m, 2.5 mW about 10 m, 1 mW about 1 m. In practice, a 2019 study in the same journal found commercial low-energy modules good for roughly 10–50 m. Bluetooth 5 (07/12/2016) added a long-range mode with up to four times the reach. Steel racking, brick walls and a body between scale and phone all cut the figure. Rule of thumb: tens of metres — and walk it with the phone before you sign.
Wi-Fi’s nominal range is about 100 m at roughly 100 mW, an open-air figure from a 2007 IEEE comparison and the 2019 Sensors study. Indoors, expect much less. But notice what the distance is measured to. For Bluetooth it is scale-to-phone. For Wi-Fi it is scale-to-router — and once the reading is on the router it can travel any distance. Wi-Fi does not give the phone more range. It takes the phone out of the equation.
One caveat both radios share. Because they use the same band they interfere with each other — packet loss and shorter range on a floor crowded with Wi-Fi networks, as a 2008 Springer coexistence study and the 2025 Sensors review note. Bluetooth hops between frequencies and, since Bluetooth 1.2, steers around busy Wi-Fi channels, so the two coexist, but each degrades the other somewhat. That is physics, not a fault in any scale, and the fix is placement: a router near the scales, not twenty networks on one channel.
Bluetooth vs WiFi weighing scale: does either one need the internet?
A Bluetooth scale needs no internet at all. The reading travels a few metres to the phone and the app records it, signal or no signal; on an HSCo Bluetooth scale that app is the HSCo Android app, which shows, records and bills.
A Wi-Fi scale that posts readings to a server needs two things working: the router, and the router’s link to the internet. The international guidance on software-controlled measuring instruments, OIML D 31:2023, is explicit about what should happen then: if network services become unavailable, no measurement data shall be lost. Its worked example is a scale storing readings in a cloud — when the connection drops, the instrument buffers new readings and sends them first-in-first-out once the cloud is back; if the buffer fills, it stops measuring rather than lose a weight. HSCo’s Wi-Fi scales post each stable reading to the HSCo cloud service and wait for an acknowledgement; a store-and-forward buffer of the kind OIML describes can be added where an outage cannot be tolerated. Ask any supplier: what does your scale do during a three-hour internet cut?
TRAI reported 1,092.79 million internet subscribers at the end of March 2026 — 1,046.26 million of them wireless and only 46.54 million on wired lines. A phone with data is close to universal on a factory floor; a fixed line at the scale is the exception. So a Wi-Fi scale needs a router with a live uplink — a fixed line where there is one, a 4G/5G router where there is not — while a Bluetooth scale rides on the phone already in the operator’s pocket.
Battery or mains? The radio decides
The second question after “who must see it” is “what powers the scale”. A Bluetooth Low Energy radio transmits at roughly 1–10 mW and Wi-Fi at about 100 mW, according to the 2016 IJWMN comparison. In commercial modules, the 2019 Sensors study measured 7–11 mA of transmit current for Bluetooth against 100–150 mA for Wi-Fi — a small fraction, roughly ten times less. Researchers at the University of Strathclyde put the consequence in one line in 2016: Wi-Fi’s relatively high power requirement conflicts with long battery life.
So a battery-powered scale — a crane scale on a hook, a portable platform wheeled between godowns — favours Bluetooth, and a mains-powered scale bolted to a packing line can afford Wi-Fi. That is why HSCo’s Bluetooth crane scales pair with a phone, and why the Wi-Fi option sits on scales that live near a socket.
What each one costs, and which one for which job
On a new Hindustan Scale Company scale, connectivity is a factory-fitted option. The indicative September 2026 configuration prices, before GST, are ₹4,500 for Bluetooth and ₹6,500 for Wi-Fi — for connectivity fitted on a new scale; a retrofit module for a scale you already own is a separate product, priced separately on the Bluetooth module and Wi-Fi module pages. Weighing machinery attracts 18 % GST (HSN 8423) on top. On the far end sit the HSCo Android app for Bluetooth and the HSCo cloud dashboard for Wi-Fi, listed on the IoT connected weighing scales page.
The ₹2,000 gap is not the decision. This table is.
| Where the weight is taken | Who must see it | Choose | Why |
|---|---|---|---|
| Crane hook in a yard or foundry bay | The operator, phone in hand | Bluetooth | Battery-powered; phone within tens of metres; no router at height |
| Poultry shed, mandi, shop counter | The person billing on the spot | Bluetooth | Reading, record and bill on one phone; no internet needed |
| Packing line inside a plant | The owner or accounts, elsewhere | Wi-Fi | Nobody stands at the scale; the router carries it to the dashboard or ERP |
| Twenty scales across one site | One screen for all of them | Wi-Fi | Each scale posts on its own; a phone cannot be in twenty rooms |
| Portable platform moved between godowns | Whoever is with it | Bluetooth | No fixed router follows it; the phone does |
| Site with no router and no fixed line | The owner in another city | Wi-Fi with a 4G/5G router — or Bluetooth now, Wi-Fi later | The uplink is the constraint, not the scale |
HSCo’s connected scales carry both paths, so a scale can be ordered with Bluetooth, Wi-Fi or both.
What a Bluetooth or Wi-Fi scale is not
It is not a change to the legal reading. The stamped display remains the weight the law recognises; the transmitted copy carries it faithfully and adds a time and a scale identity.
Wi-Fi is not mobile data. The scale does not take a SIM card; it needs a router within range, and that router needs a live link out.
Bluetooth is not “wireless to the office”. If the office is 80 m and three walls away, the phone must come to the scale, not the other way round. Wi-Fi is the radio for a reader who is somewhere else.
What changes for you on Monday morning
- With Bluetooth, the operator’s phone becomes the register. The weight appears on the app the moment it is stable, the bill is raised on the spot, nothing is re-typed. No router, no internet, no IT call.
- With Wi-Fi, you see every scale from one screen — last reading, last seen, which one has gone quiet — from anywhere.
- Either way, the weight leaves the scale on its own. The number on the record is the number the scale showed.
- The wrong choice shows within a week. A Wi-Fi scale in a shed with no router posts nothing. A Bluetooth scale whose operator walks off with the phone records nothing. Choose by who must see the weight and both vanish.
How to decide in thirty days
- Walk the floor. For each scale, note who reads the weight and where they stand. Always the operator: Bluetooth. Someone who is not there: Wi-Fi.
- Check the power. Battery-powered — crane, portable, hanging — leans Bluetooth. Mains-powered can take either.
- Check the network. Is there a router within tens of metres of the scale, with a live internet link? If not, fit a 4G/5G router or start with Bluetooth.
- Pilot one scale for thirty days. Bluetooth: one operator, one phone, the app. Wi-Fi: one scale on the router, one dashboard. Count readings captured against weighments made, minutes saved on entry, and any gap during an outage.
- Roll out by the numbers, not by the brochure.
Hindustan Scale Company has made weighing scales in Mumbai since 1955 and builds both radio modules, the app and the cloud dashboard itself — one supplier for the whole chain, from the waterproof platform scale with Bluetooth that many first pilots start on.
Frequently asked questions
Which is better for a weighing scale, Bluetooth or Wi-Fi?
Neither is better; they answer different questions, so choose by who must see the weight and where they are standing. Bluetooth sends the weight to a phone, tablet or PC standing within tens of metres of the scale, with no router and no internet. Wi-Fi sends it through the building’s router to a server or dashboard that anyone can read from anywhere.
Does a Bluetooth weighing scale need an internet connection?
No. The reading travels directly from the scale to the phone app, which records it whether or not the phone has a signal. Internet is only needed later, if the phone shares its records with a server.
How far does a Bluetooth weighing scale work from the phone?
It depends on the radio’s power class, the antenna and what stands in the way. Peer-reviewed studies put practical low-energy modules at roughly 10–50 m, with steel and walls cutting that further. Treat tens of metres as the rule of thumb and test it on your own floor before buying.
Do I need a licence to use a Bluetooth or Wi-Fi scale in India?
No. Both radios use the 2.4 GHz band that India de-licensed on 28/01/2005 under GSR 45(E). The equipment itself should hold a WPC equipment type approval, which is a question for the supplier, not a licence for the user.
Can a battery-powered crane scale use Wi-Fi?
It can, but it will not run long. A Wi-Fi radio draws roughly ten times the transmit current of a Bluetooth Low Energy radio in commercial modules, which is why battery-powered crane and portable scales favour Bluetooth and mains-powered scales can afford Wi-Fi.
How much does Bluetooth or Wi-Fi add to the price of a scale?
Indicatively, before GST, about ₹4,500 for Bluetooth and ₹6,500 for Wi-Fi when fitted on a new HSCo scale, plus 18 % GST. A retrofit module for a scale you already own is a separate product with its own price on the product page, and the app or dashboard on the far end is priced separately.
Next step
Compare every HSCo Bluetooth weighing scale side by side, with capacity, reading steps and price: Bluetooth weighing scales.
Tell us who must see the weight and where they stand, and we will recommend Bluetooth, Wi-Fi or both for a thirty-day pilot on one scale.
Hindustan Scale Company (HSCo) · Mumbai · est. 1955 · www.hindustanscale.com · hsc@hindustanscale.com
Sources
- Department of Telecommunications (WPC Wing) — Delicensing in 2.4 to 2.4835 GHz band, GSR 45(E) dated 28/01/2005; Telecommunication Engineering Centre — Essential Requirements for equipment operating in the 2.4 GHz and 5 GHz bands (EIRP 200 mW indoor / 4 W outdoor); WPC Equipment Type Approval certificate NR-ETA/3213 (03/11/2015); LoPRA Lab — summary of the 2.4 GHz Exemption Rules, 2005 (2024).
- CBIC — Instruction No. 24/2024-Customs (22/10/2024); Bureau Veritas CPS — India WPC Wing introduces ETA through self-declaration on Saral Sanchar (2019); PCN Global India — WPC De-Licensed Frequency Bands in India: 2026 guide.
- Bluetooth SIG — Understanding Bluetooth Range; Topology Options; Afaneh M., “Wireless connectivity options for IoT applications” (Bluetooth SIG blog, 21/04/2020).
- Koulouras G., Katsoulis S., Zantalis F. — “Evolution of Bluetooth Technology: BLE in the IoT Ecosystem”, Sensors 25(4): 996 (2025).
- Gomez C., Oller J., Paradells J. — “Overview and Evaluation of Bluetooth Low Energy”, Sensors 12(9) (2012).
- Borza P. N., Machedon-Pisu M., Hamza-Lup F. G. — “Design of Wireless Sensors for IoT with Energy Storage and Communication Channel Heterogeneity”, Sensors 19(15): 3364 (2019), Tables 1–2.
- Elkhodr M., Shahrestani S., Cheung H. — “Emerging Wireless Technologies in the Internet of Things: a Comparative Study”, International Journal of Wireless & Mobile Networks 8(5) (2016); Lee J.-S., Su Y.-W., Shen C.-C. — “A Comparative Study of Wireless Protocols: Bluetooth, UWB, ZigBee, and Wi-Fi”, IEEE IECON 2007.
- Song M., Shetty S., Gopalpet D. — “Coexistence of IEEE 802.11b and Bluetooth: An Integrated Performance Analysis”, Mobile Networks and Applications (Springer, 2008); IEEE conference paper on adaptive frequency hopping for Bluetooth–802.11b coexistence (2004).
- Thomas D., McPherson R., Paul G., Irvine J. — Optimizing Power Consumption of Wi-Fi inbuild IoT device, University of Strathclyde (2016).
- TechCrunch — “Bluetooth 5 will bring higher speeds, better range and a focus on IoT” (08/12/2016), quoting the Bluetooth SIG.
- OIML D 31:2023 — General requirements for software-controlled measuring instruments (clause 6.3.4.4 example; “Transmission delay or interruption”); PTB news, 19/08/2024.
- TRAI — Indian Telecom Services Performance Indicator Report, January–March 2026, via Press Information Bureau; reprinted by The Tribune and Newkerala (2026).
- CBIC — Notification No. 9/2025-Central Tax (Rate), 17/09/2025, Schedule II S. No. 412 (HSN 8423, weighing machinery, 18 %); EximPe HSN 8423 rate finder (2026).
- Hindustan Scale Company — scale configurator, indicative configuration prices (September 2026, before GST); Bluetooth module and Wi-Fi module product pages (retrofit modules, priced separately).