The popularity of Pulsed Electromagnetic Field (PEMF) therapy has grown rapidly over the past few years. As a result, there are now hundreds of PEMF devices on the market, ranging from wearable applicators and targeted pads to full-body PEMF mats.

With so many options available, comparing PEMF devices has become increasingly difficult. Many products highlight the potential benefits of PEMF therapy but provide very little information about the technology and engineering behind the device itself.

Imagine buying a car without knowing the engine size, fuel efficiency or safety rating. Most of us wouldn't make such an important purchase without understanding the specifications - yet many people unknowingly do exactly that when buying a PEMF device.

This guide explains the key technical specifications worth asking about before purchasing any PEMF device. Whether you choose BEST CELLF® or another manufacturer, we believe consumers deserve transparency.

Why Specifications Matter

Not every PEMF device is built the same.

Two products may both claim to provide "PEMF therapy", yet differ significantly in:

• Coil design

• Magnetic field strength

• Frequency range

• Waveform

• Slew rate

• Polarity

• Heating technology

• Safety certifications

• Electrical shielding

These factors all influence how the magnetic field is generated and delivered.

A reputable manufacturer should be able to explain each of these specifications clearly.

1. What Type of Coils Does the Device Use?

The coils are the heart of every PEMF device.

They generate the pulsed magnetic field that interacts with the body, making coil design one of the most important factors affecting performance.

Questions worth asking include:

• Does the device use genuine copper coils?

• How many coils are inside?

• Are they large or small?

• Are they spiral coils or ferrite-core style?

• How/where are they positioned across the device?

Larger precision-wound copper coils generally provide broader magnetic field coverage than very small coils, meaning more consistent exposure across the treatment area.

The material matters too. Copper has excellent electrical conductivity, making it ideal for producing stable and consistent magnetic fields. The quality and gauge (thickness) of the copper wire also influence the coil's performance and longevity. Well-designed coils using appropriately sized copper wire are better equipped to withstand repeated use over many years.

BEST CELLF® Specification

Our New Gen Full-Body PEMF Mat features 10 large precision-wound copper spiral coils; the Compact Mat uses 4; and the PEMF Belt uses a single large precision-wound copper spiral coil. Every device uses the same engineering principles, with the only difference being the treatment area.

2. What Is the Magnetic Field Strength?

Magnetic field strength is usually expressed in Gauss (G) or milliTesla (mT) and describes the intensity of the magnetic field produced by a PEMF device.

Many people assume that a higher Gauss rating automatically means a better device. In reality, magnetic field strength is only one part of the equation. Waveform, slew rate, coil design, frequency and magnetic field distribution all influence how a PEMF system performs.

It's also important to understand that there isn't a single "correct" Gauss measurement. Unlike measuring the length or weight of an object, the strength of a magnetic field changes continuously with distance from the coil. Even moving a Gauss meter by a few millimetres will produce a different reading.

Manufacturers may measure:

• Directly on top of the coil

• At the surface of the mat

• At a specified distance above the mat

• As the peak field or an average field

Because there is no universally adopted method for quoting PEMF intensity in consumer products, comparing Gauss figures between brands can be misleading unless the measurement method is also disclosed.

For this reason, it's worth asking:

• Where was the Gauss measured?

• Was it measured directly over the centre of the coil or elsewhere?

• Is the published value the peak magnetic field or an average?

• How was it verified?

A transparent manufacturer should be able to explain not only the number itself, but also how it was obtained.

BEST CELLF® Specification

Each of our large precision-wound copper spiral coils in our mats produces a peak-to-peak magnetic field strength of up to 20 Gauss measured at the coil our PEMF pad/belt produces up to 40 gauss. We test Gauss with an oscilloscope paired with a MagWave sensor specifically engineered for measuring PEMFs. A standard gaussmeter is typically suited to static fields and is likely to underestimate PEMF gauss. Like all magnetic fields, the intensity naturally decreases with distance from the source. We publish the peak per-coil magnetic field because it provides a clear and repeatable engineering reference point for comparing the performance of our devices.

3. What Is Slew Rate?

Slew rate is one of the least discussed specifications in the PEMF industry, yet it may be one of the most informative.

It describes how rapidly the magnetic field rises and falls during each pulse - in simple terms, how quickly the magnetic field reaches its peak and changes direction, rather than just how strong it becomes.

Imagine turning on two taps that both eventually fill a bucket with the same amount of water. One reaches full flow almost instantly, while the other builds up more gradually. Although both deliver the same volume of water, the first changes much more rapidly. Slew rate is similar - it reflects how quickly the magnetic field changes, not simply its maximum strength.

Why does this matter?

According to Faraday's Law of Electromagnetic Induction, it isn't simply the strength of the magnetic field that induces electrical currents within conductive tissue - it is the rate at which the magnetic field changes (dB/dt).

Think of Gauss as describing how high the magnetic field reaches, while slew rate describes how quickly it gets there.

This means two PEMF devices may have similar peak Gauss levels, yet the device with the faster-changing magnetic field may induce stronger electrical currents. This is one reason why Gauss alone doesn't tell the full story.

Slew rate can vary considerably between PEMF devices depending on factors such as the waveform, coil design and driving electronics. While there is no universally accepted "ideal" slew rate, it's a valuable specification because it provides additional insight into how a PEMF system generates its magnetic field.

Ask the manufacturer:

• What is the device's slew rate (dB/dt)?

• How was it measured?

• Was it calculated or directly measured?

• Was testing performed using a pickup loop and oscilloscope?

A manufacturer that understands its engineering should be able to explain not only the value itself, but also how it was obtained.

BEST CELLF® Specification

Our New Gen range has a measured slew rate of approximately 25 Tesla per second (T/s), determined using a calibrated pickup loop and oscilloscope, with calculations based on Faraday's Law (dB/dt = Vpeak ÷ (N × A)). 

Rather than focusing solely on peak Gauss, we believe publishing our slew rate provides a more complete picture of our PEMF technology and reflects our commitment to engineering transparency.

 

4. What Waveform Does the Device Produce?

• Square wave
• Sinusoidal / sine wave
• Sawtooth
• Trapezoidal

BEST CELLF® Specification

5. Is the Magnetic Field Alternating?

Another commonly overlooked specification is polarity.

Some devices produce magnetic fields in one direction only.

Others alternate direction with every pulse.

Alternating (bipolar) polarity provides balanced magnetic exposure by continually switching north and south with each pulse.

BEST CELLF® Specification

Our New Gen devices use bipolar alternating polarity (50/50 duty cycle), helping create balanced magnetic exposure throughout each session.

6. What Frequency Range Is Available?

Different PEMF sessions may use different frequencies depending on the desired experience.

Rather than being limited to one setting, many users appreciate the ability to customise sessions.

Ask:

• Can frequencies be adjusted manually?

• Are there preset programs?

• What frequency range is available?

BEST CELLF® Specification

Our PEMF devices include:

• Manual frequency selection from 1-100 Hz

• Five professionally designed signature programs

• Easy-to-use touch-screen controller

This provides flexibility while remaining simple enough for everyday users.

7. Has the Device Been Designed for Low EMF?

Ironically, a PEMF device designed to produce magnetic fields should minimise unwanted electric fields.

Ask the manufacturer:

• Is the power supply grounded?

• Has the device been designed to minimise stray electric fields?

• Is electromagnetic shielding incorporated?

BEST CELLF® Specification

Our devices use a grounded Australian-compliant AC-to-DC power supply combined with conductive shielding, helping minimise unwanted electric and radiofrequency fields while delivering low-voltage (36V DC) power to the device.

8. Is It Independently Certified?

Safety should never be overlooked.

Look for recognised certifications demonstrating compliance with electrical safety requirements.

Examples include:

• Australian electrical compliance

• CE marking

• EMC compliance

These indicate that the product has been independently assessed against recognised safety standards.

BEST CELLF® Specification

Our New Gen range is certified to Australian electrical safety requirements (AESS, EESS and SAA) and carries CE marking.

9. Does the Company Believe in Transparency?

Perhaps the most important question isn't about the device at all.

It's about the company behind it.

A manufacturer should be willing to answer questions such as:

• What type of coils are inside?

• How many coils are there?

• What waveform is used?

• What is the magnetic field strength?

• What frequencies are available?

• Is the polarity alternating?

• What is the slew rate?

• How is it measured?

• What certifications does it have?

If these questions can't be answered, it becomes difficult to make an informed comparison.

At BEST CELLF®, we believe consumers deserve to understand the technology they're investing in. That's why we openly publish our engineering specifications and continue to test our devices using equipment such as oscilloscopes, Gauss meters and magnetic polarity demonstrations.

10. Does the Company Offer Local Support, After-Sales Service and Warranties?

A quality PEMF device is designed to provide years of regular use, so it's worth considering what happens if you have questions or ever need assistance.

Before purchasing, ask:

• Is the company based in your country?

• Can you speak to a real person if you need help?

• Do they provide training or user guidance?

• Is there a local warranty process?

• Can repairs or replacement parts be handled locally, or would the device need to be shipped overseas?

Having a local company that provides knowledgeable support can make a significant difference to your ownership experience. Faster communication, local warranty support and access to replacement parts can minimise downtime and provide greater peace of mind.

BEST CELLF® Support

BEST CELLF® is an Australian-owned company, and we're committed to supporting our customers long after their purchase. We provide local customer support, comprehensive user guides, instructional videos, our free PEMF companion app, and assistance with any questions that arise. All PEMF systems include a 12-month warranty with the ability to extend to four years. Should a repair ever be required, our products are designed to be serviced here in Australia whenever possible, helping to reduce delays and avoid the inconvenience of international shipping.

The Bottom Line

Choosing a PEMF device isn't about finding the biggest marketing claim or the highest Gauss number. It's about understanding how each specification was taken into consideration in the engineering design and whether the manufacturer is transparent about its design.

Before purchasing any PEMF device, ask about the coil design, magnetic field strength, slew rate, waveform, polarity, frequency range, heating technology, safety certifications and testing methods. BEST CELLF proudly shares specifications on our New Gen PEMF mats throughout our website.

Whether you choose a BEST CELLF® device or another brand, asking these questions will help you make a more informed decision and encourage greater transparency across the PEMF industry.