Thermapen® ONE

The Fastest: Full readings in ONE second or Less

The Most Accurate: ±0.5°F (±0.3°C)

The Most Reliable: Designed for the commercial kitchen

As Seen On
“The most accurate and best instant-read thermometer on the market today is, hands down, the ThermoWorks Thermapen ONE. It is consistently accurate to half of a degree Fahrenheit. It offers a temperature reading in one solitary second, quicker than you can even say the word temperature.”
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ONE. Second. Readings.
Thermapen ONE almost moves at the speed of thought...allowing you to focus exclusively on the quality of your work.
More Accurate
With an improved accuracy spec of ± 0.5°F (± 0.3°C), you’ll know your lightning fast Thermapen ONE readings are always accurate, as well.
Brighter Backlight
The automatic backlight is brighter and the light sensor is more sensitive to changes in ambient lighting conditions.
5-Year Warranty
The newly designed rugged, waterproof case features a 5-year warranty against defects.
With a newly designed battery compartment for easier access to the user settings and all the amazing features you love—auto-rotating display, motion-sensing sleep and wake mode, waterproof to IP67, NIST-traceable calibration certificate—you'll need to get ONE for yourself to understand the power of sub-second performance.

From the Blog

Backyard Cookouts—From Steaks to Chicken to Brats, You Need Fast Temps
Planning a cookout with friends and family? You need to be temping those steaks, brats and burgers! Avoid the dry-meat-cookout blues with the power of thermometry...

Spare Rib Temps: Barrel-cooked Glory
Outstanding taste and texture in spare ribs are not hard to master if you understand the basic principles of time and temperature during your cook.

Homemade Ice Cream: Temperatures for Smooth and Creamy Results
If you want a smooth, creamy ice cream—as opposed to a coarse, icy one—you need to take care with the ingredients and the temperatures.

Digital Instant-Read Thermometer: Winner
"Our former favorite instant-read thermometer, the ThermoWorks Thermapen Mk4, has been discontinued. We tested its replacement, the ThermoWorks Thermapen ONE, and found that we liked it even better than the old model. We highly recommend the ONE; it is our new winner."
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ThermoWorks Thermapen ONE Review
"We tend to get picky with the reviews here and can generally find something that, at least in our opinion, could be improved. We’re hard-pressed to do that for the Thermapen ONE; there’s simply nothing, from a functionality perspective, that we think could be improved."
Read the Review

Thermapen One Review | Best BBQ thermometer
"This is the bestest, baddest thermometer you will ever get. It’s the best example of “buy once, cry once” in my entire BBQ journey. This may be the best thing I’ve ever bought…and the thing I’m most happy with...."
Watch the Review

"ThermoWorks Thermapen ONE is honestly the best instant read thermometer we've tested to date. So, if you like to have the best of the best, look no further and order ONE for yourself...."
Read the Review

ThermoWorks Thermapen ONE Review
Thermoworks Thermapen ONE is the newest addition to an excellent line-up of their instant-read thermometers. Its unmatched speed, accuracy, and feature set have raised the bar for cooking accessories.
Read the Review

Specifications
Range -58.0 to 572.0°F (-49.9 to 299.9°C)
Accuracy ±0.5°F (±0.3°C) from -4 to 248°F (-20 to 120°C) otherwise ±1.8°F (±1.0°C)
Resolution Factory set to 1° (user reconfigurable to 0.1°)
Response Time Full reading in 1 second (0.2 seconds time constant)*
Probe 4.3 L inches x 0.12" dia. (reduces to 0.06" dia.), High Performance Type K Thermocouple
Display 1 H x 1.54 W inches (25 H x 39 W mm) LCD, rotates 360°, Intelligent Backlight
Sleep Mode 10 to 180 seconds, user selectable (user reconfigurable to disable)
Water Resistance IP67
Operating Range –4 to 122°F (–20 to 50°C), max ambient limits of Thermapen body
Battery 1.5 volt AAA, 2,000 hours typical (without backlight)
Dimensions 6.1 W x 1.7 H x 0.74 D inches (156 W x 48 H x 19 D mm)
Weight 0.25 lbs (115g)
Warranty 5 years
Certificate Includes NIST-traceable calibration certificate
* Response time defined as five time constants for 99.3% of actual temperature.

With full readings in just one second, Thermapen ONE is in a category by itself when it comes to “instant-read” thermometers. Thermapen ONE achieves a new standard of accuracy, as well—now accurate to ±0.5°F (±0.3°C)—so you know your readings are correct. To achieve this level of performance without resorting to algorithms or mathematical adjustments, Thermapen ONE truly pushes the boundaries of sensor and electronic measurement engineering.
New: Unparalleled speed with full temperature readings in less than one second
New: Industry leading accuracy to half a degree: ± 0.5°F (±0.3°C)
New: Brighter intelligent backlight display automatically illuminates in low-light and when the sensor window is covered
New: Easy access battery housing uses one common AAA battery for a 2,000-hour battery life
New: Five-year warranty
Motion-Sensing Sleep and Wake Mode: intuitively turns on and off—or when picked up or in use and off when set down to save battery
Patented 360° auto-rotating display uses accelerometer technology to intuitively turn right-side up
Shockproof, dustproof, and waterproof with an IP67 rating for water-tight seals
Foldaway design protects probe when not in use
Polygiene Biomaster Antimicrobial Silver Ion Technology reduces microbial growth
Hand washable
Display temperatures in °F or °C, 1° or 0.1° resolution
Each Thermapen ONE includes a NIST-traceable calibration certificate verifying accuracy to national standards
The new Thermapen ONE includes professional level features at an affordable price, including an auto-rotating display, which uses accelerometer technology to detect screen motion/orientation for use in either hand (similar to smartphone orientation); a battery-saving sleep/wake mode; fully waterproof IP67 design; new brighter automatic backlight for use at night or in low light; 2,000-hour battery life using one AAA battery with new easy-access battery housing; and included NIST-traceable calibration certificate for increased confidence in its performance. Thermapen ONE lets everyone “seek perfection” when cooking at home, in the BBQ pit, or for daily use in professional restaurants, to measuring critical temperatures in labs, food processing plants, grocery stores, and more.
Downloads
Download Thermapen ONE Operating Instructions
Download Thermapen ONE Calibration Trim Instructions
Download Thermapen ONE Product Info Sheet

Changing the Battery

Installing a Silicone Boot

Leather Wallet for Thermapen, WAND, and More
Fits Thermapen with or without silicone boot installed. Also great for WAND. Protect your investment.
$22.00
Quantity:
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Thermapen® ONE Silicone Boot, Magnetic Glow-in-the-Dark
Magnetic, Thermapen ONE glow-in-the-dark, translucent, protects from drops and radiant heat.
$16.00
Quantity:
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Protective Zip Wallet
Padded vinyl pouch with zip closure and carry loop, protects and stores. (Fits Thermapen and WAND.)
$13.00
Quantity:
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Thermapen Wall Bracket
Stainless steel wall bracket with mounting holes for Thermapens. Fits Thermapen ONE with boot installed (rear-facing) as well as all models of Thermapens without boots installed.
$22.00
Quantity:
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Thermapen Magnetic Band and Lanyard
Keep your Thermapen ONE safe and within reach. This low-profile magnetic silicone band and detachable lanyard secures your Thermapen ONE to any metal surface or around your neck — ensuring it’s always handy when you need it most.
$9.99
Quantity:
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2,637 Ratings
4.8out of 5 stars
2,637 Ratings
Rated 5 stars by 93% of reviewers
Rated 4 stars by 3% of reviewers
Rated 3 stars by 2% of reviewers
Rated 2 stars by 0% of reviewers
Rated 1 star by 1% of reviewers

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Why did you choose this?
ThermoWorksStore
Great review from wire cutter. waterproof .
ED BJul 3, 2025
Used before and wanted to replace it.
AMOS SJul 3, 2025
It registeres the temp quickly and is recommeded by my son who has had one for several years.
CYNTHIA NJul 2, 2025
I’ve got one that’s been great and I’m buying another one for a gift.
SAM PJul 2, 2025
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Thermapen® ONE
Quantity:

Specifications
Range	-58.0 to 572.0°F (-49.9 to 299.9°C)
Accuracy	±0.5°F (±0.3°C) from -4 to 248°F (-20 to 120°C) otherwise ±1.8°F (±1.0°C)
Resolution	Factory set to 1° (user reconfigurable to 0.1°)
Response Time	Full reading in 1 second (0.2 seconds time constant)*
Probe	4.3 L inches x 0.12" dia. (reduces to 0.06" dia.), High Performance Type K Thermocouple
Display	1 H x 1.54 W inches (25 H x 39 W mm) LCD, rotates 360°, Intelligent Backlight
Sleep Mode	10 to 180 seconds, user selectable (user reconfigurable to disable)
Water Resistance	IP67
Operating Range	–4 to 122°F (–20 to 50°C), max ambient limits of Thermapen body
Battery	1.5 volt AAA, 2,000 hours typical (without backlight)
Dimensions	6.1 W x 1.7 H x 0.74 D inches (156 W x 48 H x 19 D mm)
Weight	0.25 lbs (115g)
Warranty	5 years
Certificate	Includes NIST-traceable calibration certificate

You May Also Like

Thermapen® ONE Silicone Boot, Magnetic Glow-in-the-Dark
Magnetic, Thermapen ONE glow-in-the-dark, translucent, protects from drops and radiant heat.
$16.00
Quantity:
More Info
Leather Wallet for Thermapen, WAND, and More
Fits Thermapen with or without silicone boot installed. Also great for WAND. Protect your investment.
$22.00
Quantity:
More Info

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