is supported by our Pitmaster Club. Also, when you buy with links on our site we may earn a finder’s fee. Click to see how we test and review products.

ThermoWorks Thermapen ONE Review

Share on:
ThermoWorks Thermapen ONE
Best New Products 2021 Logo

The newest Thermapen, the Thermapen ONE, adds to an extensive list of excellent products from this company. Long the standard by which other instant read thermometers are judged, the Thermapen has evolved again in its feature set, accuracy, and speed.

The new Thermapen ONE features a one-second response time. For the mathematically inclined, that’s a time constant of 0.2 seconds, so the reading reaches 99.32 percent of its final value in one second. I’m going to have to take their word for it because I can’t get my stopwatch to measure that closely.

The thermometer can be configured to have a 1° or a 0.1° resolution; it comes from the factory set to 1°. The display has a smart backlight that comes on when the light is dim (or you cover up the sensor next to the display with your thumb.) The numbers on the display can be set to rotate in 90° or 180° increments, or not rotate at all, selectable via the setup menu in the battery compartment. The display numbers are slightly larger when read horizontally. Power is supplied by a single AAA battery and is claimed to last 2000 hours if the backlight isn’t used.

The Thermapen ONE comes in ten different colors so you can accessorize your apron. The warranty is a very generous five years.

The trend these days is to skimp on documentation, referring the user to a website. ThermoWorks takes a different approach: they give you TWO manuals, one “quick start guide” that gives you an overview and a second that goes into all the details. It’s worth reading! You also get a certificate of calibration so you know your thermometer is accurate.

Contact info can be found in the instruction manuals if help is required. You’ll find a telephone number, e-mail address, physical address, and website URL.

This thermometer has stolen a march on the instant read category with its ultra-fast response and excellent accuracy. I miss having a Hold button in some situations where I can’t read the display easily, but that’s my only gripe. Construction is robust and the unit is briefly submersible. Yeah, it’s pricey, but you only pay for it once. Top honors all around.

  • Thermometer Function:
    Hand Held
  • Item Price:
    $ 105.00
  • Where to buy (buying from this supplier supports this website):
  • Probe:
    Length: 4.4" (11.2cm), diameter: 0.13" (3.3mm), tip: 0.064" (1.6mm)
  • Battery Type:
    1xAAA (supplied)
  • Battery Life:
    2000 hrs. (mfgr.)
  • Safe Operating Range:
    –4 to 122°F (–20 to 50°C)
  • Min & Max Temp:
    -58 to 572°F (-49.9 to 299.9°C)
  • Display Precision:
    1° or 0.1°
  • Actual Temp at 32 Degrees:
  • Actual Temp at 130 Degrees:
  • Actual Temp at 225 Degrees:
  • Actual Temp at 325 Degrees:
  • Speed from 32 to 212 Degrees:
    ~1 sec.
  • Speed from 32 to 212 Degrees:
    ~1 sec.
  • Numbers Display Size:
    horizontal: 0.6" (15mm), vertical: 0.47" (12mm)
  • Water Resistance Rating:
  • Weight:
    0.25 lbs (115g)
  • C/F Switch:
    Built in CF switch
  • Backlight:
    Built in Backlight
  • Auto shutoff:
    Has Auto Shutoff
  • Color Options:
    Ten colors available-see website
  • Thermometer Sensor:
  • Included:
    Thermometer, instructions, calibration certificate
  • Available Accessories:
    Silicone Protective Case

Related reviews

Published On: 6/24/2021 Last Modified: 11/29/2021

  • Bill McGrath - Bill McGrath is's Thermometer Maven. He has sophisticated equipment, an electrical engineering degree from Cornell University, and an MBA (almost) from UC Berkeley. Despite being mostly retired, he is still the person responsible for developing and updating all of ExxonMobil's training modules.


High quality websites are expensive to run. If you help us, we’ll pay you back bigtime with an ad-free experience and a lot of freebies!

Millions come to every month for high quality tested recipes, tips on technique, science, mythbusting, product reviews, and inspiration. But it is expensive to run a website with more than 2,000 pages and we don’t have a big corporate partner to subsidize us.

Our most important source of sustenance is people who join our Pitmaster Club. But please don’t think of it as a donation. Members get MANY great benefits. We block all third-party ads, we give members free ebooks, magazines, interviews, webinars, more recipes, a monthly sweepstakes with prizes worth up to $2,000, discounts on products, and best of all a community of like-minded cooks free of flame wars. Click below to see all the benefits, take a free 30 day trial, and help keep this site alive.

Post comments and questions below


1) Please try the search box at the top of every page before you ask for help.

2) Try to post your question to the appropriate page.

3) Tell us everything we need to know to help such as the type of cooker and thermometer. Dial thermometers are often off by as much as 50°F so if you are not using a good digital thermometer we probably can’t help you with time and temp questions. Please read this article about thermometers.

4) If you are a member of the Pitmaster Club, your comments login is probably different.

5) Posts with links in them may not appear immediately.



Click for comments...


These are not ads or paid placements. These are some of our favorite tools and toys.

These are products we have tested, won our top awards, and are highly recommend. Click here to read how we test, about our medals, and what they mean.

Use Our Links To Help Keep Us Alive

A big part of this site is our unbiased equipment and product reviews. We love playing with toys and we have no problem calling them the way we see them. Some companies pay a finder’s fee if a reader clicks a link on and buys a product. It has zero impact on our reviews, zero impact on the price you pay, and the sites never tell us what you bought, but it has a major impact on our ability to keep this site alive! So before you buy, please click our links. Here’s a link that takes you to a page on Amazon that has some of our favorite tools and toys:

BBQ And Grilling Gifts For Every Occasion

Looking for the perfect gift for the BBQ and grilling enthusiasts in your life? Here’s our suggestion for platinum and gold medal-winning products at a variety of price points. Click here to see our list of Gold Medal Gifts.

Bring The Heat With Broil King Signet’s Dual Tube Burners

3 burner gas grill

The Broil King Signet 320 is a modestly priced, 3-burner gas grill that packs a lot of value and power under the hood including dual-tube burners that are able to achieve high, searing temps that rival most comparatively priced gas grills. Click here to read our complete review.

A Propane Smoker That Performs Under Pressure

The Masterbuilt MPS 340/G ThermoTemp XL Propane Smoker is the first propane smoker with a thermostat, making this baby foolproof. All you need to do is add wood to the tray above the burner to start smokin’. Click here to read our detailed review.

The Good-One Is A Superb Grill And A Superb Smoker All In One

The Good-One Open Range is dramatically different from a traditional offset smoker, placing the heat source behind and under the smokebox instead of off to the side. Click here to read our complete review.