ThermoWorks is well established in the wireless leave-in thermometer market, and for good reason. The brand offers a range of high-quality products that suit casual cooks, backyard grillers, and competition teams alike. After testing several ThermoWorks devices in the past, we evaluated the new ThermoWorks Smoke X4 RF (radio frequency). Think of it as the original Smoke, upgraded: it expands to four channels and delivers dramatically improved range. Below is a clear, concise review of this four-channel device.
The Smoke X is available in two variants: the Smoke X2 and the Smoke X4. The primary difference is probe capacity—two probes for the X2 and four for the X4—while both models otherwise operate the same way. We tested the Smoke X4 model with its four probes.
Unlike ThermoWorks Signals, which uses Wi‑Fi, the Smoke X4 relies on radio frequency like the original Smoke but with vastly increased range. The Smoke X4 base unit transmits temperature data to a battery-powered receiver using improved RF technology, providing a line-of-sight range that ThermoWorks specifies at 6,562 feet (1.24 miles). In practical terms, this means far greater distance between the cooker and the person monitoring temps, as long as there’s minimal interference from structures or other electronic devices.
The Smoke X4 ships with the base unit, a receiver, AA batteries for both units, three Pro-Series high-temperature cooking probes, one Pro-Series high-temperature air/grate probe with a grate clip, a set of high-temperature silicone color rings to help identify probes, and a quick-start guide.
Both the base unit and the receiver feature large displays that show all four probe temperatures at once. The base unit also displays Max and Min temperatures for the current cook as well as the Hi and Low alarm settings; the receiver shows current temps and alarm set points. Both units include magnets on the rear for mounting to metal surfaces. The base has a fold-out stand and a simple control panel on the back.
Both units are splash resistant with an IP66 rating, meaning they are dust tight and can withstand powerful water jets from any direction. They are not designed for submersion, but they handle rain and typical outdoor conditions without issue.
Each channel includes adjustable Hi/Low alarms and a variable alarm volume—up to 90 dB on the base unit and up to 70 dB on the receiver. The receiver updates readings from the base every 30 seconds, providing consistent remote monitoring.
The base can be powered by batteries or by an optional USB-C 12V adapter sold separately. The Smoke X4 supports pairing with multiple receivers, so several team members can monitor the same base. It is also compatible with ThermoWorks Billows BBQ Temperature Control Fan for automated airflow control, which is sold separately.
Item Specs
- Operating Range: 14°F to 122°F (-10°C to 50°C)
- Probe Range: -58°F to 572°F (-50°C to 300°C)
- Probe Cable Max Temp: 700°F (370°C)
- Probe Cable Length: 47 inches
- Sensor Type: Thermistor
- Water Resistance: IP66 Splash Proof
- Transmission Range: 6,562 ft (1.24 miles) line of sight
- Radio Frequency: 915 MHz
- Battery Life: Base Unit: 2x AA – ~330 hours; Receiver: 2x AA – ~1,800 hours
- Dimensions: Base Unit: 3.78 x 4.68 x 1.01 in; Receiver: 4.44 x 2.04 x 1.10 in
What We Loved
The Smoke X4 shares ThermoWorks’ reputation for solid build quality and straightforward operation. Setup is effortless: power on the base and receiver and they link automatically. That simple, reliable pairing makes the Smoke X4 immediately usable even for novice cooks. The alarm menu and settings are intuitive.
Range performance impressed us. The Smoke X4 stayed connected over long distances and through challenging environments during our tests. Adjustable alarm volume is a practical touch—use lower volumes for backyard cooking and louder settings for noisy outdoor events.
Design improvements on the receiver include recessed buttons to prevent accidental presses and a flat base that allows the unit to stand upright on a table or work surface. Most importantly, the four-channel capability is excellent. Monitoring multiple points in the cooking chamber—different meats or various locations on a grill—gives a clearer picture of cooking conditions and helps produce consistent results.
What Could Be Improved
The colored silicone probe rings are a useful idea for quick identification, but they tend to discolor with exposure to smoke and can be difficult to clean. To avoid staining, slide the rings down the cable so they sit outside the hot, smoky cooking chamber during long smokes; that preserves their color and usefulness.
Who It’s For
The Smoke X4 suits anyone who needs more than a two-channel thermometer or who wants to monitor multiple points inside a cooker simultaneously. Even if you typically cook a single protein, tracking temperatures in different locations of the cooking chamber is valuable for achieving consistent results.
This unit is ideal for cooks who prefer a remote read solution without Wi‑Fi or a smart device. Competition teams, event cooks, and backyard enthusiasts who want freedom of movement will appreciate the long RF range and the ability to add additional receivers so multiple people can monitor the same cook.
The Smoke X4 is well matched to moderate-heat techniques such as smoking, oven roasting, deep-frying, and grilling. It is not intended to replace quick digital instant-read thermometers for rapid spot checks.
Final Thoughts
We could not test the Smoke X4 to the manufacturer’s full line-of-sight range due to local topography, but our real-world tests still showed excellent performance. In a dense area with buildings and electronics interference, the unit maintained connection for about 900 feet. In a more open environment with some terrain obstruction, it remained reliable at roughly 2,800 feet. Those results demonstrate strong RF performance in practical conditions.
Because it does not rely on Wi‑Fi or an app, the Smoke X4 is easy to use: turn it on, set alarms, and monitor temps from a distance. If you prefer a standalone receiver and want dependable range without cloud connectivity, the Smoke X4 delivers a no-nonsense solution that simply works. For most users seeking a multi-probe leave-in thermometer, this is among the best options available.
