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Thermapen off by 1.2 degrees

Iceman5705Iceman5705 Posts: 83
edited April 2012 in EggHead Forum

Was making some pasta tonight and decided to show my brother how awesome and accurate my Thermapen is....or thought it was!

See below. We are off by 1.2 degrees. Any remedies.



  • Sorry guys. On my iPad. Couldn't upload pic.
  • centex99centex99 Posts: 231
    I assume you're measuring boiling water and it was off 1.2 degrees... there was no pic posted...
    where are you located?  What's your altitute and/or pressure?  Also salt and/or oil can affect the boiling point of water...
    Here is a calculator for altitude...
  • I did have a good bit of salt in the pot.
  • As soon as any of the salt dissolves in the water, the boiling point of the water will begin to rise -- by about one half degree Celsius for every 58 grams of salt dissolved per kilogram of water. In fact, any non-volatile soluble substance will raise the boiling point of water. That is why antifreeze (ethylene glycol) provides boiling protection in winter as it simultaneously provides freezing protection in the summer. 

  • By the way, I had no idea that was true...just Googled it so it has to be real, right?????

  • Little StevenLittle Steven Posts: 27,583
    Does it really matter?


    Caledon, ON


  • It was low not high.
  • GatoGato Posts: 766
    Matters to some, not to others. Not a big deal but we did pay around 90 bucks for a precision temp tool... Yep matters to me.
    Geaux Tigers!!!
  • xraypat23xraypat23 Posts: 421
    low = higher elevation. where do you live? 
  • Toledo, Ohio.
  • stikestike Posts: 15,597
    was there a high or low pressure system in the area? what was the atmospheric pressure in mB or mPa at the time you noted the discrepancy? and did you take the temperature in an insulated flask while vigorously stirring the water? :)

    in other words, even in boiling water, or ice water, just moving the thing around will cause the thermomter to read different temps.

    no way to know if it is truly 'off' without worrying about a bunch of other factors that really don't make much difference in the end

    ed egli avea del cul fatto trombetta -Dante
  • stikestike Posts: 15,597
    edited April 2012
    boiliing point of water in Toledo Ohio, elev. 665 feet.


    an answer provided in the very first response by centex...
    ed egli avea del cul fatto trombetta -Dante
  • Wow Stike...was able to get to my PC to post the pic.  You were dead on.  Thanks so much for your help.  Rock on Eggheads!

    boiling.jpg 312.6K
  • GatoGato Posts: 766
    That's why we paid 90 bucks for it.
    Geaux Tigers!!!
  • centex99centex99 Posts: 231
    That and we just like fancy toys... :-)
  • stikestike Posts: 15,597
    @gato:   but unless you are keeping track of the altitude, and all the other variables, that 1 degree is virtually meaningless

    ed egli avea del cul fatto trombetta -Dante
  • centex99centex99 Posts: 231
    Plus the accuracy is +/- 0.7 degrees anyway...
  • centex99centex99 Posts: 231
    The real benefit is the speed it takes a measurement... plus its nice, big, and easy to read/hold, and makes small holes if you barely puncture with just the end...
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