EMS Machine Buying Guide: Specs, Site Power and Payback

Buying an EMS machine comes down to three questions a quotation rarely answers: whether the two numbers defining its output can actually be verified, whether your building can carry it, and whether enough clients will book it to pay it back. This guide works through those three in order, then lays four units currently in production side by side — including the specification fields their own sheets leave blank.

The Two Numbers That Get Blurred in Every Quote — Magnetic Flux Density and Pulse Width

Two specifications decide what an EMS machine can actually do, and both are routinely written in a way that cannot be verified: magnetic flux density, quoted in Tesla, and pulse width, quoted in microseconds.

Here is a four-model comparison filled in exactly as the manufacturer publishes it — including the fields left blank.

Технические характеристики	GN687	GN687B	GN786	GN777E
Form factor	Floor-standing	Floor-standing	Портативный	Floor-standing
Плотность магнитного потока	0–15 T	0–15 T	0–7 T	0–15 T
Частота импульсов	1–100 Hz	1–100 Hz	Not stated	Not stated
Ширина импульса	Not stated	Not stated	300 μs	300 μs
Радиочастота	5 МГц	5 МГц	Not stated	Not stated
Ручки	4	4	2	4
Мощность	6,500 W	6,500 W	1,000 W	6,500 W
Дисплей	15-дюймовый	15-дюймовый	10,4-дюймовый	12.1-inch touch
Вес упаковки	95 kg	95.3 kg	42 кг	Not stated

Read the blanks as carefully as the numbers. Four of the nine rows are incomplete on at least one model, and three of those rows are incomplete on two models at once: pulse frequency, pulse width, and RF frequency. The pattern is consistent — the figures a buyer can compare are published, and the figures that would settle an argument are not.

What magnetic flux density actually tells you

Tesla measures field strength at the applicator surface. Published figures across this category vary widely by device and by measurement method, which makes a straight number-to-number comparison close to meaningless. A figure quoted at peak is not the figure a clinic runs at, and a figure measured at one applicator position says nothing about the fall-off across the treatment area.

What a buyer can do is force the comparison onto one footing. Ask each supplier the same three questions and read the answers next to each other: measured at the surface or at peak, at what duty cycle, with which applicator. A supplier who can only say “15 Tesla” without saying how it was measured has given you marketing, not a specification.

Suppliers also claim that higher density shortens the session needed to reach a given contraction force and allows larger muscle groups to be engaged. That may be true, but it follows from the protocol and the coil design as much as from the Tesla figure, and no supplier will put it in writing without being asked. Treat it as a claim to be substantiated, not a specification to be compared.

Pulse width is the number that decides session behaviour

Pulse width, measured in microseconds, sets how long each contraction stimulus lasts. A 300 μs figure is common in the category. What matters for a buyer is not the shape of the pulse on paper but whether the same pulse is delivered at minute one and minute twenty-five, on every applicator, without drifting as the unit warms up.

Ask for an oscilloscope capture rather than a number on a page. A waveform recorded at the start and at the end of a session tells you whether the generator holds output under thermal load — the failure mode nobody advertises. The same discipline applies to the RF side of a combined platform, where frequency and current path change the depth of heating, as covered in our comparison of 448 kHz, RF, EMS and cavitation.

Three things to request before signing

• Field distribution across the applicator surface, not a single peak figure. You want to know where the field is strong and where it falls off, because the fall-off zone is where clients report “it felt weaker on that side.”
• Waveform capture at the start and end of a session, on the same applicator, at the same setting. This is the thermal-stability test, and it takes a supplier ten minutes to produce if they have the equipment.
• The duty cycle the Tesla figure was measured at. A peak figure quoted at 10% duty cycle is not the number your clinic will run at.

If a supplier cannot produce any of the three, that is an answer in itself. Move to the next one. Our guide to reading a beauty machine specification sheet covers the same logic across other device categories.

Floor-Standing vs Portable: Room, Power and Sharing a Treatment Room

The choice between a floor-standing EMS machine and a portable unit is usually framed as a budget decision. It is really a decision about rooms, circuits, and who else has to use the machine.

Power is the constraint nobody checks first

A 6,500 W EMS console running on 220 V draws roughly 30 A. That is not a device you plug into an existing ring main next to a facial bed — it needs a dedicated circuit, and in most buildings that means an electrician, a breaker upgrade, and a day of disruption before the machine is even unboxed.

A 1,000 W portable unit draws under 5 A at 220 V and around 9 A at 110 V. That is within the range of a standard outlet in most markets, subject to the plug type, grounding and local electrical code — check all three rather than assuming voltage compatibility is enough. The GN786 portable two-handle platform is built to that brief: 42 kg, 57 × 45 × 46 cm, 100–230 V.

This is the single most common reason a clinic buys the wrong EMS machine. The purchase order clears, the crate arrives, and the unit sits in a corridor for three weeks waiting for the electrical work. Budget for the circuit before you budget for the machine.

	Floor-standing (GN687 / GN687B / GN777E)	Portable (GN786)
Power draw	6,500 W — dedicated circuit required	1,000 W — standard outlet, subject to local code
Вес упаковки	95 kg (GN777E not stated)	42 кг
Размер упаковки	71 × 58 × 121 cm (GN687)	57 × 45 × 46 cm
Аппликаторы	4	2
Лучшее для	Dedicated body room, high daily volume	Shared room, multi-site, mobile service

What four applicators actually buy you

Four applicators mean four treatment zones running at once, or one zone treated in quadrants without moving the client. On a protocol covering abdomen and both flanks, a four-handle unit can work all three areas in a single pass. A two-handle unit treats one area, then the next — which either extends the session or reduces the number of areas you can sell in one booking.

That difference is worth roughly one extra booking slot per day at full utilisation. Run that slot through your payback model rather than comparing applicator counts directly. Our sourcing guide across nine device categories uses the same per-slot logic for other modalities.

Sharing a treatment room changes the answer

If the EMS machine has to live in a room that also runs facials, injectables or laser, the floor-standing console becomes a scheduling problem. It occupies roughly 1.5 × 0.8 m plus the couch, and it cannot be moved between appointments. A portable unit at 42 kg with a 57 cm footprint can be wheeled out and stored, which is what makes shared-room clinics viable in the first place.

The trade-off is throughput. A shared-room clinic running a portable unit is capped at two applicators and lower sustained power. If EMS is going to be more than 20% of your body-treatment revenue, the dedicated room and the floor unit are the cheaper long-run answer despite the electrical work.

Zero Consumables Is Not Zero Cost — What an EMS Machine Actually Spends Per Session

An EMS machine is genuinely consumable-free compared with hydrafacial, microneedling or laser. There are no tips, no filters, no solution bottles, no per-shot counters. That is a real advantage, and it is oversold into a claim that the machine costs nothing to run.

It does cost something, and the number matters because it sets your floor price.

The per-session cost stack

Cost line	What it is	How it scales
Electricity	6,500 W unit at 30 min = about 3.25 kWh per session at full draw	Fixed per session; higher on 4-applicator units
Conductive gel	5–10 ml per treatment area	Scales with areas treated, not sessions
Applicator wear	Cable strain, strap and gel-pad replacement	Scales with session count; the real long-run line
Время простоя	Sessions lost while a unit is serviced	Scales with how far the supplier is from you

Electricity and gel together stay in single-digit currency units per session in most markets. The line that matters over five years is applicator wear and downtime, and neither appears on a quote. Cables and gel pads are the two parts that wear first, and both are cheap to replace on a schedule and expensive to replace in a hurry — the interval is worth agreeing with the supplier before the first cable fails, and our clinic service schedule for water and handles sets out how to plan it.

Why the contribution margin looks unusually good

Because there is almost no cost of goods, EMS carries a higher net contribution than any consumable-based treatment on the same menu. Where a hydrafacial or microneedling protocol returns 35–50% of the ticket after consumables, room cost, staff time and card fees, an EMS session can return 70–85% — the consumable line is nearly empty, so only labour and room time come out.

That changes the payback arithmetic in your favour, and it also changes how you should price. Run the standard formula:

Payback (months) = Machine cost ÷ (Average ticket × Sessions per day × 22 operating days × Net contribution margin)

Take a four-handle floor unit in the $10,000–16,000 band, a $150 ticket and one and a half sessions a day at a 0.75 contribution. At $12,000 that returns in about three months. At a $90 ticket and one session a day, the same machine takes about eight. The machine did not change; the booking density did.

Which is the useful conclusion: for a zero-consumable device, the variable that decides payback is sessions per day, not price negotiation. Spending two weeks shaving 8% off the purchase price moves the date by a few weeks. Filling one more slot per day moves it by months. Our breakdown of what a branded system costs runs the same numbers from the top of the market.

Who Should Be Screened Out Before Booking — BMI, IFU Limits and the Clients Who Won’t Convert

Most content about buying an EMS machine explains who the treatment is for. The commercial problem is the opposite: clinics sell sessions to clients who will not see a result, then absorb the complaint, the refund request, and the review.

Screening is not a clinical nicety. It is revenue protection — and it has to follow the device’s own instructions for use, not a general rule of thumb picked up from a blog.

Why BMI comes up, and what the number actually means

Magnetic field strength falls off with distance from the applicator, and subcutaneous fat is distance. That is the reason body-composition comes up at all in this category.

What it does not mean is that a specific number is a physiological cliff. The published clinical work behind the branded devices enrolled patients at an average BMI around 25, largely under 30. Later iterations of the same technology extended the treated range to about 35. Those are enrolment characteristics from trials, not a threshold that predicts any individual outcome.

So the practical approach is a screening consideration rather than a hard rule: check BMI as one input, look at fat distribution as another, and let the device’s IFU and a clinician set the boundary. A client at 29 with concentrated abdominal adiposity may respond differently from a client at 31 with a different distribution. The number alone does not decide it.

The questions to put to the IFU and a clinician

Contraindication lists vary by device, by market and by the regulatory clearance under which a unit is sold. The list below is the set of questions to check against the specific IFU you are selling under — not a universal exclusion list that applies to every machine.

• Metal implants or electronic devices in or near the treatment area — surgical hardware, joint replacements, implanted contraceptive devices, pacemakers and neurostimulators. Check the IFU wording for each; they are not treated identically.
• Беременность — check the IFU for the treatment area and the market; most clearances exclude it outright.
• Recent surgery in the target area — the waiting period depends on the procedure and on the surgeon’s sign-off. Take the surgeon’s clearance rather than a fixed number of weeks from a supplier’s brochure.
• Hernia, diastasis or a known abdominal wall defect — needs clinical clearance before treatment, regardless of what the marketing says.
• Any condition the IFU names — read it. It is a short document and it is the only list that matters if a question is ever asked afterwards.

Write the screening decision down, including the ones you decline. A documented “we did not treat this client, and here is why” is the cheapest protection a clinic can hold.

The expectation gap that costs more than the contraindications

The clients who generate complaints are rarely the ones with a contraindication. They are the ones who booked EMS expecting weight loss.

EMS is sold as a muscle and contouring treatment. Weight change is not the outcome it is designed to produce, and a client who steps on scales after eight sessions and sees the same number has been sold the wrong outcome even if the treatment worked exactly as intended.

Set the expectation in the consultation, in one sentence, before payment: this changes shape and tone, not weight; the scale may not move and that is expected. Clinics that say this upfront report fewer disputes than clinics that let the marketing claim do the talking. If you are positioning EMS alongside fat-freezing, our comparison of muscle stimulation versus the branded alternatives sets out where the two categories actually diverge.

What to Check on a Demo Unit in 30 Minutes

Most purchase decisions are made on a video call and a specification sheet. Thirty minutes with a demo unit will tell you more than either, provided you test in the right order — and the order matters, because the first two checks take five minutes and eliminate most of the field.

1. Count the handles against the contract

Four-handle systems are sold as four-handle systems, but crates arrive with mixed applicator sizes, and the large body handle is usually the one that decides throughput. Count them, match them against the model code on the crate, and photograph the layout before you power anything up. A missing large handle is a five-figure difference on some configurations, and it is far harder to resolve once the unit is installed.

2. Fire every handle, not just one

Run each applicator individually and check that the output reading on screen matches the setting you dialled in. A handle that reads correctly but produces no contraction is usually a coil fault, and it will not surface until a client is on the bed. Do this while the supplier is still in the room.

3. Measure it, don’t read it

Ask for the measurement method, then verify it. If the unit is quoted at a given flux density, the supplier should be able to state whether that figure is peak or surface, and at what duty cycle. A gauss meter held against the applicator face tells you whether the claim survives contact — and any supplier who resists that test has told you something useful anyway.

4. Let it run for thirty minutes

Continuous operation is where undersized power supplies reveal themselves. Run all handles for half an hour at clinical settings and watch for a drop in output, a rise in fan noise, or a thermal warning. A unit that throttles after twenty minutes is not broken — it is rated for a duty cycle below a busy clinic’s day, which is a specification you can plan around only if you have seen it.

Record what you find against the model code on the crate, and keep the sheet. It becomes the baseline for the warranty conversation six months later.

Verified Model Shortlist

Four EMS machines currently in production, with the specifications as published and the fit each one is actually built for. Every model below has a live product page and a documented parameter set; nothing here is a catalogue placeholder.

Модель	Построить	Best fit
GN687	Floor-standing, 4 handles, 0–15 T, 1–100 Hz, 5 MHz RF, 6,500 W, 15-inch screen, 95 kg	Dedicated body room running high daily volume; the reference configuration for a four-applicator protocol
GN687B	Same platform and same published parameters as GN687; packing 73 × 64 × 125 cm, 95.3 kg	Buyers who need the same capability with a slightly larger crate — check door and lift dimensions before ordering
GN786	Portable, 2 handles, 0–7 T, 300 μs, 1,000 W, 10.4-inch screen, 42 kg, 100–230 V	Shared treatment room, multi-site operation, mobile service; runs from a standard outlet subject to local code
GN777E	Floor-standing, 4 handles, 0–15 T, 300 μs, 6,500 W, 12.1-inch touch screen	Four-applicator throughput where the smaller screen and control set are acceptable

Two notes on reading this table. First, GN687 and GN687B publish identical electrical and magnetic specifications — the difference between them is the crate, not the capability, so the choice comes down to logistics. Second, GN777E publishes pulse width but not pulse frequency, while GN687 publishes frequency but not pulse width. Those are the blanks to fill with a supplier question before you commit, not after.

Questions Buyers Ask Before Signing

Does a higher Tesla rating mean better results?

Not on its own, and not reliably across suppliers. Higher figures usually reflect a peak or surface measurement rather than a sustained clinical output, and the figure has to be read together with its measurement method — surface or peak, at what duty cycle, with which applicator. Ask for the field distribution and the duty cycle before comparing two numbers.

Can I run a 6,500 W EMS machine on a normal socket?

No. At 220 V that is roughly 30 A, which needs a dedicated circuit and usually a breaker upgrade. Budget the electrical work as part of the purchase, and confirm the site’s supply capacity before the crate ships. Portable 1,000 W units run from a standard outlet in most markets, subject to plug type, grounding and local code.

How many sessions before a client sees a change?

Most protocols run four to six sessions over two to three weeks. Response varies with body composition and adherence, and a client who screens poorly will not respond better to more sessions — they will respond better to a different treatment. Set that expectation at consultation rather than at session five.

Do I need the RF function?

It depends on your menu and on what the clearance allows you to claim. RF is commonly marketed for skin tightening and superficial fat heating in the same session, which lets you sell one booking as a combined treatment — check the marketing claims permitted in your market before you build a menu around it. If you do want RF, check the frequency: 5 MHz on GN687 and GN687B is a documented figure, while some units carry an RF label without publishing the frequency. What RF genuinely changes on a body treatment, and what it does not, is set out in our EMS versus radio frequency comparison.

What should I ask for before paying a deposit?

Four documents: the IFU for the exact model and market, a field distribution across the applicator surface, a waveform capture at the start and end of a session, and the packed dimensions in centimetres matched against your door and lift. All four are answerable in a day by a supplier who has the equipment in front of them.

Comparing four-handle platforms for a dedicated body room? Сайт GN687 four-handle EMS and RF platform publishes its full parameter set — 0–15 T, 1–100 Hz, 5 MHz RF, 6,500 W across four applicators — and ships with the manual and packing dimensions on the page, not on request.

Specifications in this article are quoted as published by the manufacturer. Where a field is marked “not stated,” the manufacturer’s current documentation does not list it. Buyers should request measured data rather than relying on published nominal figures, for any brand.