Whether you realize it, an invisible force surrounds you at all times. No, we’re not talking about something out of Star Wars. Instead, we’re talking about electromagnetic and radio fields, or EMF and RF for short. The Earth itself generates an electromagnetic field, which is what makes a compass work. And modern technology, whether it’s the electrical current that powers your appliances, microwave ovens or telephones, all generates some kind of electromagnetic radiation.
What to consider before buying a radio frequency detector
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When purchasing an RF detector, it’s important to familiarize yourself with the signals you may encounter. EMF and RF signals are referred to together, but they are usually distinguished by frequency intensity. EMF occurs at a lower level - we find it in electrical cables carrying alternating currents, such as the wires in your walls and the power cords in your appliances. Any device used to transmit data, such as radio receivers, TV antennas, Wi-Fi routers and cell phones, uses radio waves.
We can detect both types of frequencies with a handheld detector. We can use rF detectors for counter-surveillance. If they have bugged a room with surveillance equipment such as recorders or cameras, an RF detector can help find them. This may seem like a far-fetched question, but much privacy concerns have been raised regarding private vacation rentals, where hosts spy on tenants.
Some radio frequency detectors can detect low-level electromagnetic fields, which can be useful if you work in electrical engineering. You can help identify problems with faulty wiring, for example.
How we chose the best radio frequency detectors
Because there are many signals you may encounter, we selected detectors that can identify both RF and lower-level EMC signals. We focused on intuitive options that the average person can use, and our choices are small enough to pack in a bag and travel with.
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1. TriField Electric Field and Radio Frequency Meter
This handy tool can help detect many types of electromagnetic signals. The adjustable dials allow you to track alternating magnetic and electric fields, as well as radio frequencies and microwaves. A clearly marked button on the unit lets you search for the signals you’re looking for, without unwanted background information. The digital display is easy to read, and it changes automatically to help you find hot spots. This option uses an alkaline battery, rather than the rechargeable batteries used by the GQ, ERICKHILL and other detectors on this list.
Advantages: Allows you to detect different EMF. The indicator bar on the intuitive digital display makes it easy to locate hot spots.
Cons: Not as accurate for RF as for other EMFs. More cumbersome than some of the other options on this list.
Buy: TriField Electric Field and Radio Frequency Meter
2. GQ RF Meter
This GQ meter measures three different frequencies, including electromagnetic fields (EMF), extremely low frequency fields (ELF) and radio frequencies (RF). The convenient back-lit display shows all three frequencies on the same screen, so you can get a quick reading. The display has an auto-rotate feature, similar to a cell phone display, that rotates the screen as you turn the unit. The device is very compact, and the lanyard makes it easy to carry.
Benefits: Detects ELF, EMF and RF signals and displays them on a convenient three-way digital screen that automatically rotates with the position of the device. Very compact design.
Disadvantages: This device is not as effective at picking up weaker signals and works best near powerful signals.
3. ERICKHILL EMF Meter
If you’re specifically looking to detect weak signals, this EMF meter from Erickshill is an affordable option worth considering. Unlike the GQ and Trifield options, this detector does not look for radio frequencies, but it looks for electric fields. Like the GQ RF detector, this detector uses a rechargeable battery.
Advantages: Convenient rechargeable battery. Economical option. Intuitive design.
Cons: Although it looks for EMF signals, it does not measure RF.
4. Poniie Digital Multi-Field EMF Meter (RF)
This economical option from Poniie scans both RF and EMF signals, making it a versatile tool for a variety of applications. Like the Erickhill and GQ detectors, this option relies on a convenient rechargeable battery. The large, back-lit display makes it easy to get an at-a-glance reading.
Benefits: Detects RF and EMF signals. Convenient rechargeable battery. Economical option.
Disadvantages: Some high-end options may be more reliable.
Buy: Poniie (RF) Digital Multi-field EMF Meter
5. KORKUAN RF Detector
If you’re particularly concerned about your privacy and security, then this detector from Lonove has several features to detect hidden cameras, bugs and other invasive devices. It has a radio frequency detector to find signals that may come from various sources. The attached probe makes it easy to locate signals, and an illuminated display on the unit shows signal strength. The infrared window helps you locate hidden cameras.
Pros: Handy device for finding invasive devices. The RF detector helps you find listening devices, and the IR window helps you find night vision cameras.
Cons: Not designed to detect weak EMF signals.
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