Long Stem Calibration Thermometer

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Discontinued by Bulk Reef Supply
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Why Does BRS Recommend This?

The exact thermometer we use to calibrate our temperature probes, heaters and any other device that requires calibration. We will usually double check calibration with the VWR Thermometer about once a month, and you may be surprised what you find with your probes or heaters calibration over time.


Fully Calibrated using instruments traceable to the National Institute of Standards and Technology

There has never been an easy and precise way to calibrate temperature probes since most thermometers are made cheaply and are very unreliable. With the VWR Long-Stem Traceable Thermometer, you can accurately calibrate your temp probe or other temperature sensing devices. The thermometers are all individually certified and guaranteed to be accurate within ±0.5°C @ 25°C.

  • Calibration Certificate Included
  • Reliable & Accurate
  • 8" Long Probe
  • Armored Guard Included
  • Reads in Celcius or Fahrenheit
  • Easy to Read LCD Display

Temperature probes have always been one of those things in the hobby that you pay 40-60 dollars for the probe but calibrate it with a thermometer that you have had laying around for ten years that only cost you 2 bucks. In most cases, we find that using multiple (3 or 4) thermometers was the only way to calibrate a temp probe semi-accurately until we came across these.

We have found most temperature sensing devices could be off anywhere from one degree all the way up to 8 degrees from the stated temperature. The Traceable Long Stem Calibration Thermometer will let you properly calibrate your temp probes accurately and keeping the ecosystem at a proper temperature. It is recommended to have it recertified every two years from the certification date keeping the readings accurate.



  • Resolution - 0.1° above -20°C and below 200°C
  • Sampling Rate - 1 second in °C mode / 10 seconds in °F mode
  • Range - -50 to 150 °C / -58 to 302 °F
  • Accuracy - ±0.5 °C at testing points
  • Stem Length - 8"
  • Overall Length - 11"
  • Stem Diameter - 1/8"
  • Overall Diameter - 1.2"


We do not recommend leaving this particular thermometer in the water long term as it is not designed to be used as a temperature monitor. It is best practice to place the thermometer in the tanks water, next to the probe you wish to calibrate for about 10 minutes, then turning the calibration thermometer on and proceeding with calibration of the probe.


What's Included?

  • Long Stem Temperature Probe
  • Armored Sheeve
  • Certification Documentation
  • Battery
  • Instructional Pamphlet


More Information
UPC 846699106995
Dimensions 8"L Probe, 11"L Body
Diameter 1/8" Probe, 1.2" Body
WiFi No
Temperature Range -58°F - 302°F
Additional Notes Operates with a 1.5 volt silver oxide size 357 battery (included)
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Product Questions

What does "traceable" mean?
Question by: Clint Parsons on Jan 17, 2020, 11:31 AM
Hey there!

It means traceable to the National Institute of Standards and Technology. A very precise and accurate thermometer basically
Answer by: Thomas Billington on Jan 17, 2020, 12:16 PM
What are the battery specifications? My old eyes can't make out the numbers on the battery.
Question by: John Hildebrant on May 25, 2019, 12:43 PM
Hey there,
Great question! The battery is a 1.5 volt silver oxide size 357 battery. Make certain the positive (+) side is visible when replacing and please let us know if you have any further questions. Happy Reefing!
Answer by: Mark Schlough on May 28, 2019, 4:57 PM