ThermoWorks Signals [Full Review]

by Top Geek  

Last Updated: May 23, 2023

ThermoWorks Signals Review & Testing

The Signals is ThermoWorks’ 4-channel WiFi/Bluetooth Thermometer combo, and it’s one of the best we’ve ever used. Here’s our take and why it sits in our #1 spot as the best WiFi thermometer.

signals thermometer device in box

Why We Like It

Whether you’re a professional BBQ competitor or just an enthusiastic backyard BBQ aficionado, the ThermoWorks Signals deserves a spot in your smoking tool lineup. It’s a commercial-grade smart thermometer with 4 probe channels, comes with 4 probes, connects to your phone via both WiFi and Bluetooth, and is built like a veritable tank, with a splashproof, IP66-rated casing.

Unboxing the Signals

Props to ThermoWorks for sending the Signals out so quickly. It arrived – neatly packaged – on our front doorstep the day after ordering. That’s faster than Amazon Prime, for those keeping score – they even threw in a pack of Jelly Beans.

Note: You can not purchase any ThermoWorks devices from Amazon. If you would like to purchase Signals, visit to avoid getting taken by purchasing an imitation knockoff. Here’s the disclaimer listed at the top of the ThemoWorks website:

Warning regarding ThermoWorks products at Amazon, eBay and other sites:

The lowest internet prices for ThermoWorks products are available at and through special offers received by subscribers to ThermoWorks emails. Amazon, eBay,, and their sellers are NOT Authorized Dealers. There are unscrupulous sellers at those sites who have purchased ThermoWorks products at retail prices and are then re-selling them at significantly elevated prices, sometimes 2 to 4 times the Authorized List Price.

product inside box

When you remove the Signals from its attractive, very-descriptive and frustration-free packaging, you’ll find:

  • (1) Signals device
  • (3) Pro-Series High Temp Cooking Probes
  • (1) Pro-Series High Temp Air (Ambient) Probe
  • (1) USB-C cable charging cable
  • (1 )12v USB power adapter
  • (1) Instruction Card and Temperature Chart


view of digital display


signals parts on table


The back of the box lists all the specs you need to know. Some of the more important are:

  • Probe Range: -58F to 572F
  • Probe Cable Range: 700F Max (Take Note: This is important. More on this later)
  • Probe Accuracy:
    • +/- 1.8F (from -4F to 248F)
    • +/- (from 248F to 392F)
    • +/- 5.4F (From 392 to 572F)
  • Water Resistance: IP66 Splash-Proof
  • Probe Type: Thermistors
  • Battery: 16 Hours
  • Charge Time: 12 Hours

We’ll be putting all those to the test numbers to the test to see if they can achieve what they say they can.

Our first impression of this thing is that it’s tough – and very compact.

Build construction and quality are superb. It’s a very strong, durable plastic (likely polycarbonate) and it inspires confidence – something we’re always looking for in our devices.

ThermoWorks says it is IP66-rated. That means it’s splashproof, as well as entirely dustproof and particle-resistant. We don’t doubt it and have no fear of it getting a bit wet while cooking – whether from water or flying, hot grease.

While it’s not protected against full immersion, we didn’t have any problems running it quickly under the tap. ThermoWorks makes no mention of impact-resistance, but it felt durable enough that we got adventurous and dropped it off the counter onto the deck. It keeps performing like a champ and without a scratch. So it can handle a couple tumbles.

Friendly Disclaimer: We don’t suggest subjecting your Signals to intentional abuse tests like this. It’s not worth pushing your luck and breaking a device this nice. And while ThermoWorks does include a 2-Year Warranty, that warranty doesn’t include damage willfully inflicted because you saw some geeks on the internet do it.


Intuitive, Sturdy Design

Once we acclimated to just how solid this thing is, we noticed how good the overall design and interface is. The flat bottom has a rubberized grip that allows it to sit sturdily on the grill or countertop, and the front is gently angled to make it easy to quickly glance at the LCD screen.

front with temp display
side of thremoworks device
back of the device

This angled design also make it easier to access the six frontal buttons, which control navigation, select between channels, set alarms, adjust volume, and adjust brightness. The power button is located on the back.

On the side are the 4 probe ports and a USB-C charging port. As far as we know, the Signals is the only smart meat thermometer that employs USB-C (more on this later).

On the back you’ll find two magnets for securing the device to the grill (or stove or oven). These magnets are fairly strong, too; he device firmly latches on to the side of the grill with a snap, and stays there until you make a real effort to pull it off.

Large LCD Screen

Navigating the device is easy and straightforward. The LCD screen itself is simple, showing WiFi and battery, and each of the 4 probe channels in their own corner. Each probe channel displays its own Max Temp, Min Temp, Alarm On/Off, and Current Temperature. The current temp reading is big and bold – unlike a few other displays we’ve used – and it’s a breeze to glance at from a distance.

screen schematics

The screen is also comfortably large, for that matter. We love how everything you need to see is displayed front and center, as well as constantly during use. It has a nice backlight, which can be toggled on and off using the lightbulb button on the front and via the power button on the back.

One great option that we’re glad the Signals includes is toggling alarm volume with a dedicated button on the front. You can set alarms to one of 4 volume levels or silence them entirely. They also recently updated their firmware to silence button clicks when the device is set to silence mode.

Setup and Connectivity

One of the best things about the Signals – and something that few other smart thermometers can do – is connect to both Bluetooth and WiFi. That’s twice the fun in one device!

WiFi connectivity is great when you want to leave the house, run errands or just relax away from the grill during a marathon smoking session. Bluetooth is handy when you don’t have WiFi available – such as when you’re grilling out at the campsite or the tailgate. Or maybe you just want the easiest, plug-and-play connectivity possible.

To connect the Signals with the ThermoWorks App on your phone, first connect the two via Bluetooth. Then, enter your WiFi network and password – and you’re off. The whole process takes under a minute and is far simpler than it is on most WiFi thermometers. Many have a tendency for clunky, complicated setup.

The Maximum Bluetooth range on the Signals is about 95 feet, but can be less due to obstacles like walls. Walking around the house and the backyard, we stayed connected for roughly 100 feet or so. With WiFi, your range is practically unlimited thanks to cloud connectivity.


ThermoWorks is the best in the business when it comes to temperature probes. With the Signals, they have included their Pro-Series thermistor probes. There’s 3 meat probes and 1 ambient probe, which – unlike the meat probes – is straight and not pointed. ThermoWorks also includes a metal clip for situating the ambient probe on the pit grates.


Technically, thermistors are slower and less accurate than their pricier Thermocouple cousins, but we haven’t noticed any difference when actually smoking food. These Pro-Series probes have as much range as most Thermocouples, (up to 572F) and are accurate to within 1.8F. Even the best Thermocouples are only only reliable to about .7F. When actually cooking, these read plenty fast enough and aren’t discernibly slower than any other probe we’ve ever used. When tested in both boiling water and ice, they were right on target.


When choosing between various thermometers and probes, remember that thermocouples are not necessarily better than thermistors. Yes, they are more sensitive and faster – but only slightly. And you don’t need that speed and accuracy for slow-cooking. If the probe is firmly planted in the middle of the roast, the temperature rises slowly enough that the extra second or even fractions of a second more the thermistor takes, don’t even matter.

The cables are just under 4 feet long, a length we find comfortable while also still manageable. But a word of warning: while the metal probes themselves can handle some very high temperatures, the plastic connectors where the probes meet the cables aren’t as resistant. ThermoWorks rates the gray connectors safe up to 644°F and the cables themselves are rated at 700°F; we melted two connectors right around 700°F after 2 minutes.  So, you don’t want to leave the probes in when searing, just in case dripping fat causes the coals to flare up and spike heat to 600°F+.

The App

The Signals connects to the standard ThermoWorks app, which is free to download. If you’ve used it for any of their other devices, you know how straightforward and easy-to-use it is. Probe temperatures are displayed nice and big up front-and-center. You can easily set alarms and alerts and customize the probe names. And cooking graphs and session notes are quick to access and export.

showing app temp readings
Channel Dashboard
showing app temp chart
Cooking session temperature graph.
setting fan for pit temperature regulation
Setting Billows fan for pit temperature control.

ThermoWorks even lets you customize the temperature refresh rate, choosing between 10, 20, 30 or 60-second intervals. We love this, and it’s something most WiFi thermometers are sorely lacking, stuck at 1-minute intervals or needing to be manually refreshed in the app. Signals is on top of things and even tells you when it last refreshed down to the second.

Feel like switching between WiFi and Bluetooth during a single session? No problem. Just toggle your phone’s Bluetooth or WiFi on or off, and Signals automatically switches over to the other without a hitch.

The app can store all of your latest cooking sessions on the cloud, with graphs, session notes, mix/max history and alert history accessible anytime. You can also download them straight to your phone.

Signals’ Alarms: Signaling When Food is Done

As mentioned, the Signals gives you the choice to customize both High and Low Temperature Alarms for each probe. There are no fancy presets for meats, like other thermometers, but typing in the desired number is super quick and easy.

And when your food is done – you’ll know it: the alarms are VERY loud at max volume (90dB), and we could hear them from inside the house – with the door closed! The app will vibrate and beep on your phone too – just not as loudly.

Battery Life and Charging: USB-C Convenience

ThermoWorks claims Signals has 16-hour battery life with probes in and monitoring actively. We used it on a 6-hour smoke, before leaving it on overnight to see how if it could hold up to the claim. By morning, roughly 18 hours later, it was drained.

For charging, the Signals uses a USB-C cable. That’s noteworthy. As far as we know, this is the only smart thermometer to use this latest-and-greatest connector. USB-C can deliver far more power than a regular USB port – in this case, 12V vs 5V – so the battery charges exponentially faster. Somehow, it still takes about 12 hours to fully charge –a bit lengthy. You charge the device on the wall with the included AC adapter.

Putting it All Together: How ThermoWorks Signals Performs + Stacks Up

Using the Signals to smoke a piece of meat, monitor the turkey in the oven, or even just grill up some steaks, is about as easy a process as can be. You can set it up for the first time, learn to use and navigate it, and have it out there monitoring meat and smoker temperatures in less than 5 minutes. Easily. We felt confident leaving our barbecue under its watchful eye as we went about our day, and it safely, effectively alerted us when the food was done.

ribeyes smoking with probes
barrel smoker with thermometer
shot of reader stuck to barrel

Many WiFi thermometers are just too clunky to setup and unintuitive to use. The same goes for many of their respective apps. But ThermoWorks nailed it with the Signals, combining efficient design, straightforward function, accurate probes, and ease-of-use into one sturdy device. (What else would you expect from the makers of the best instant read thermometer?) It’s pricey, but cheaper than some subpar competitors, and worth every penny.

When we reach for a meat thermometer during our next barbecue, you can bet we’ll reach for this bad boy.

What We Like

  • Bombproof, Sturdy Build + IP66 Rating
  • Strong, Secure Mounting Magnets On Back
  • Large, Easy LCD Display + Backlight
  • Ability to Store Unlimited Previous Cooking Sessions
  • Dual WiFI/Bluetooth Compatibility + Seamless Switching
  • Fast, Easy Setup
  • Straightforward App
  • Fast + Accurate Pro-Series Probes
  • Loud Alarms (90 dB)

About the author Top Geek

I have always been a believer: “do what you love and you’ll never work a day in your life”. I’ve been lucky enough to use my professional experience in the meat industry over the past 20 years to create a business where I love to go to work.

Smoking Meat Geeks is all about bringing people together that enjoy food as much as I do. We provide a place for everyone to share thoughts, ideas, and recipes; to be a go-to spot for cooking inspiration. Feel free to leave a comment, say hello, or provide any tips. There is no right or wrong input, as long as you’re engaging, you’re a Meat Geek!

  • Been using for a year and i can say hands down Worst system ever.

    Must have account to run and if linked to an email address but you forget your password on the weekend, forget about using it b/c you have to contact customer service to have them remove the device from your account b/c you cant just create new account to carry on. So basically a brick.
    The battery indicator has only 2 readings full or not full. So you may start your cook thinking its full but its really only 65% and guess what its probably gonna die mid cook.

    Lastly, i have consistent wifi coverage with greater than 250Mbps coverage and have seen the app display a dramatically lower temp than the base unit is showing on several occasions … app shows 280° and i go check outside and its showing 320°

    Fundamental & debilitating problems that shouldn’t exist on a $200+ product.

    • I agree. I have really liked my Thermapen so I thought the signals was a no-brained. My first unit was a complete disaster, it would show probes that weren’t even connected, it showed a billows device which I have never had, temps were way off, etc. Thermoworks sent me another one but the design is just bad–thought I had plenty of battery but died in the middle of a cook. The app alerted me of low battery about 5 or 10 minutes before it shut off, thanks for the good warning there. Of course there’s no outlet by my grill and even an external battery pack that will charge my MacBook won’t charge this thing. The unit itself beeps so loud that my neighbor thought we had a smoke alarm going off, but the phone alerts are so quiet that I have missed multiple alarms. Constant issues connecting and dropping wifi.

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