Hands on Review: ThermoWorks 12″ and 24″ Digital Thermometers – RT610B-12 and RT610B-24

ThermoWorks 12″ and 24″ Long Stem Digital Thermometers feature waterproof casings (IP66/67 rating), long heavy duty stainless probes, a min/max feature, hold feature and a deg C/deg F switchable.

Hands on Review ThermoWorks RT610B-12 and RT610B-24

Quite a large box for two thermometersFront of the 12″ Thermometer RT610B-12 BoxFront of the 24″ Thermometer RT610B-24 Box.  Other than length, the 12″ and 24″ models have the same specifications.Side by side.  The 24″ Thermometer ends up being… massive.Top downClose up top view.  These thermometers have a quality feel.Thermapen temp probe (bottom) next to the 24″ temp probe (top).The probe on the 24″ is about… 24″ long, maybe a little longer.The probe on the 12″ is about… 12″ long, maybe a little longer.LengthThe 24″ side by side with my amazing ThermapenHands on ReviewThe 24″ model in my Igloo 10 gallon Cooler based mash tun. So… you can pretty easily see that the 24″ is long enough to be used in my mash tun.  See more about my mash tun – Hands On Review: Brew Hardware’s Cooler Mash Tun Conversion Kit – Making a Mash Tun


  • Range -58°F to 392°F (-50°C to 200°C)
  • Accuracy ±1.8°F (±1.0°C) over full range
  • Resolution 0.1° – see manual for full specification
  • SS Probe Size 0.197 (dia) x 12 (L) inches (0.137 inch diameter at tip)
  • 5 (dia) x 305 (L) mm (3.5 mm diameter at tip)
  • Environmental Range 32 to 122°F (0 to 50°C)
  • Display Reading Update 1 second
  • Response Time Approximately 15 to 20 seconds in liquid
  • Battery 1.5 volt, type A76 (LR44) or equivelant x 1 piece (included)
  • Battery Life About 5,000 hours continuous operation
  • Water Resistance IP66/67


I know of no other (reasonably priced) thermometers that are this large.  It would be nice to see a slightly tighter accuracy, but it’s only 1.1 degrees F different that the nearly universally lauded Thermapen Mk4 and the fact of the matter is, these are huge thermometers.  An accuracy of + or – 1 deg C over two feet sounds really reasonable to me.  These are classic Thermoworks… well built and well thought out.  I’ve said it several times… these are huge.  If you’re looking for a thermometer large enough to reach deep into your mash tun or fermenter, these are worth a hard look.

More: Our Last Fifty Finds!


Leave a Reply

Your email address will not be published. Required fields are marked *