Reviewed by
Reviewed by
Last updated: November 20, 2021

ThermoWorks Smoke X4 Review

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Reviewed by
Reviewed by
Last updated: November 20, 2021
LilGrill is reader-supported. We may earn a commission through products purchased using links on this page. Learn more about our process here
Ideal for:
  • Anyone looking for a remote read leave-in thermometer that doesn’t need Wi-Fi.
  • Anyone who needs to monitor various points in a cooking chamber at once.
  • Anyone looking for an extensive range in their remote read without needing their smart phones or an app.
  • 1.24miles transmission range
  • 915MHz radio frequency
  • IP66 water resistance
Editor's Rating
GrillScore is a ranking system developed by our team of experts. It aggregates all the scores given to a product in various aspects including the individual product’s features evaluation given by each expert independently, its customers’ feedback rank, and sales rank.
out of 10
  • Design 9.8
  • Accuracy 9.9
  • Features 9.7
  • Durability 9.9
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ThermoWorks has been a popular brand, best known for top quality smoke thermometers since they released the Smoke X. The brand has a pretty impressive catalog of high-end devices that any grill master or enthusiast can make the most of. The Smoke X4 is ThermoWorks’ latest wireless leave-in thermometer and it is a tad better than the other models in the Smoke X line in terms of features and performance.

The smoke X4 has 4 channels, which is two times more than that of the original smoke X. It also has 4 probes. Surprisingly, the X4 is not Wi-Fi enabled like its predecessors. It uses radio frequency like the original smoke, except the range is insanely higher. The unit uses the radio frequency to transmit information to a receiver. The advanced RF technology allows you an exceptionally extended range of up to 1.24 miles from the base unit to the receiver. Read on for some more interesting facts and information about the Smoke X4 to see if it is worth all the rave it’s getting.


Probe range
-58 to 572°F (-50 to 300°C)
Cable max temperature
-700°F (370°C)
±1.8°F (±1.0°C) from -4 to 248°F (-20 to 120°C) ±3.6°F (±2.0°C) from -58 to -4°F / 248 to 392°F (-50 to -20°C / 120 to 200°C) ±5.4°F (±3.0°C) from 392 to 572°F (200 to 300°C)
Max sound volume
90dB (base unit), 75dB (receiver)
Transmission rate
30 seconds
Cable length
Probe dimensions
6 L x 0.13 inches dia. reduces to 0.08 inches dia.
Weather resistance
IP66 Splash-Proof
Wireless connectivity
915Mhz, US and Canada only
4.68” x 3.54” x 1.10” (base unit) 4.44” x 2.04” x 1.10” (receiver)


Nearly every grill master out there swears by the Smoke X thermometer line by ThermoWorks. The X4 is the best smoking partner you can get as a grilling enthusiast. It has an exceptional range and a dedicated receiver. You don’t need an app or your phone to use it. Once you unbox the unit, it will be synced and ready to use within seconds. What’s more, the thermometer has a rugged build with digits that are large enough. Its transmitter is large and heavyweight, and it features a huge LCD screen that makes using it such a breeze.

The thermometer’s rugged design and backlit screens make it ideal for using in the outdoors. Another praiseworthy feature of the X4 is its ability to pair the transmitter with more than one receiver. This can come in handy when you have a barbecue party and you have a grilling team. The thermometer can also be paired with a billows fan. Overall, the Smoke X4 is the star of leave-in thermometers that any grill master should add to their arsenal.

Overall performance

ThermoWorks Smoke X4 Review

The Smoke X4 is a simple but well-built thermometer. The idea of the whole unit being ready to use straight out of the box is compelling. Even the most inexperienced user or grilling novice will be up and running in seconds. The menu for setting alarms is also pretty straightforward. Plus, you can adjust the volume of the alarms to avoid disturbing neighbors. The X4 sets itself apart with its intuitiveness as very few thermometers are as easy to use.

The most impressive thing about the X4 is the distance its base unit can stay connected to its receiver. Its accuracy and ability to calibrate is also outstanding. ThermoWorks outdid themselves with X4’s ingenious design. Its top-notch performance is proof enough that it was carefully thought through with the end user in mind.

Design and setup

The Smoke X4 has 2 main parts; the base unit, which is the main unit and the receiver. The base unit is the part that remains in the smoker. It has 6 buttons in the front and 4 buttons in the back. It also features a large screen with large digits that are easy to read and a kickstand that helps it remain in a standing position. In case you want to mount it on a metal object, you can use the onset magnets it comes with.

Just like the receiver, the base unit is ruggedly built with color heavy-duty plastic with excellent texture. Besides looking and feeling solid, it is aesthetically pleasing.

The receiver is the part that you can carry around when your meat is on the grill. It comes with a lanyard that you can use to carry it on your neck. It also has a screen like the main unit. Its screen is divided into sections that show you the temperature and the alarm settings. It features 2 buttons on its front, 2 inset magnets on its back and a battery compartment. You don’t need a special holder for the receiver as it has a flat bottom that easily sits on a flat surface.

Setting up the thermometer is easy breezy. All you have to do after unboxing is turn on both the base unit and the receiver. They will sync within seconds.


The Smoke X4 comes with the ThermoWorks Pro Series probes and 47-inch cables. The cables have an impressive temperature range of -50 to 300 degrees Celsius. They can withstand temperature up to 370 degrees Celsius.

The probes run through a grate clip, which is attached to your grill or smoker’s grate. You may need to bend it to fit your grate properly. The X4 comes with 4 probes; one ambient probe and 3 meat probes. The probes can be a little confusing. Color coding is the only way to tell which probe goes into which piece of meat. You will get 8 silicon rings in 4 different colors (2 of each). The rings are placed on the plug end and the probe end to color code and keep things straight.


ThermoWorks Smoke X4 Review

Connectivity is also pretty basic with the Smoke X4. The thermometer comes with 4 probe inputs. This is why it is commonly referred to as the 4-channel thermometer. 1 channel/input is for the ambient probe and the rest are for the 3 meat probes.

Also featured is a USB-C input. It is located just below the probe inputs and is meant to allow the main unit to be powered with an available power adapter. Also, you can connect the thermometer to a Billows fan controller via the USB-C input. The billows fan will control and monitor the temperature in your charcoal smoker. Here is more detailed information about the Billows fan.


You can trust the Smoke X4 to read accurately and quickly. The receiver is designed to update every 30 seconds. Whether you are a mile away from the grill by the pool side or next to the DJ’s deck you can count on it for accurate information.

The base unit is also not a lag. It will help you achieve the perfect cook as long as you get closer to it when the transmitter is within a degree or 2. The thermometer owes its accuracy to the brilliant 915MHz radio frequency. It penetrates walls and barriers better than other RF technologies. You will wander around your house and yard and won’t notice a dropout as is common with other RF thermometers.

Another exciting thing about the thermometer is the ability to calibrate it. When new from the factory, it reads + or -1.8 degrees F. You can change the probes and still never need to use the CAL function. Although you can still fine-tune the calibration for better accuracy on each channel. Re-calibrating is super-easy. You only need to press a few buttons as per the instructions provided.

Durability and warranty

Typical of ThermoWorks products, the Smoke X4 is sturdily built. Both the transmitter and receiver are splash proof with an IP-rating of 65. Their plastic bodies feel solid compared to other thermometers within its range. You can count on the unit to give you excellent value for your money with its long-lasting build.

What’s more, the X4 is backed by a 2-year warranty. The customer service is impeccable. In case you encounter any malfunctions, the ThermoWorks customer care team will care for you well.

Ease of use

ThermoWorks Smoke X4 Review

One of the main reasons why the X4 is popular is because it is incredibly easy to use. It comes with a large screen that is divided into sections for each channel. Each of the sections has an alarm setting and a backlight that you can activate for 20 seconds by hitting the light button at the bottom. The backlight does come in handy when you get up early or stay up late cooking.

The temperature settings and alarm settings come in large digits that are easy to read. Every time you turn the thermometer off/on the temperature resets itself. Setting an alarm is as simple as pressing SET then using the Up/Down arrows at the bottom of the screen to set you desired temperature for HI or LOW temperature alarms.

The best thing about the thermometer’s alarm is that you can easily mute the alarm with any button on the screen. You can also adjust the volume of the alarms. If you don’t want to disturb your neighbors, you can simply press the VOL button until you get your most desired volume.

All the buttons on the unit are pretty straightforward. The CAL button on the back allows you to calibrate the smoke which you might never need to do because the thermometer comes accurately calibrated from the factory. In case you need to calibrate, there are clear recalibration instructions.

The strange ((.)) button is the signal button. You can turn it off whenever you need to use the X4 as a standalone thermometer.

You will also appreciate the lanyard and magnets that the unit comes with. The lanyard offers easy access to the receiver, especially when you are busy doing other things. It conveniently hags the receiver around your neck. With the magnets, you can attach the unit to another smoker or piece of metal.


You will have to dig a little deeper into your pockets for the X4. As at now (June 2021) the X4 is going for 199 dollars which is a bit on the steep price end compared to standard remote thermometers.

A decent standard remote thermometer goes for about 40 to 60 dollars. However, at that price range you can forget about the accuracy the Smoke X4 offers. The build quality isn’t as good either as most of them are not even waterproofed.

At the end of the day, price is what you pay and value is what you get. The X4 is a worthy buy.


ThermoWorks Smoke X4 Review

Both the transmitter and the receiver have accessible battery compartments. All you need to remove the cover of the battery compartment is a Philips head screw. Each compartment holds 2AA batteries that power the units. Under normal use, the batteries can last you a whopping 330 hours.

Syncing multiple receivers

This is another bonus capability that sets the X4 apart from competition. You can sync several receivers to the main unit via the USB-C. This comes in handy during BBQ competitions. Everyone on your BBQ team will be able to know what’s going on at your smoker.



  • Exceptional transmission range
  • Easy to use
  • Can sync multiple receivers
  • Waterproofed
  • Durable construction
  • Doesn’t need smart devices or an app
  • Accurate
  • Does not come with a storage case for all the wires
  • The ambient temp probe doesn’t fit snug enough into the grate clip



The ThermoWorks Smoke X4 is worth all the rave it’s getting from expert reviewers and grill masters out there. The fact that it has a dedicated receiver and doesn’t require you to use a smart device or app is enough to win over any grill enthusiast. Its durable and waterproof construction is also unmatched. Not to mention its exceptional transmission range of 1.24miles that doesn’t dropout.


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