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Old 03-23-2009, 09:06 PM   #1
andreiz
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In short, do you trust the temp it's showing given that it's not measuring the beer temperature directly? I've heard there can be a difference of a few degrees between what Fermometer is showing and the actual temp.
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Old 03-23-2009, 09:10 PM   #2
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It's not going to give you a true indication of fermentation temperature, but it will show a higher temperature than ambient during strong fermentation. The only true way to know actual fermentation temp is a direct probe into the primary.
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Old 03-23-2009, 09:11 PM   #3
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Every time I have tested them they have been withing 1 degree of the actual wort.

 
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Old 03-23-2009, 09:14 PM   #4
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Quote:
Originally Posted by Tonedef131 View Post
Every time I have tested them they have been withing 1 degree of the actual wort.
Yup. There's been plenty of exploring done on this and this is pretty much the typical case.

 
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Old 03-23-2009, 09:15 PM   #5
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I usually compare the readings when I take hydro samples. Usually within one degree of the thermometer. Close enough for monitoring fermentation temps.
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Old 03-23-2009, 09:17 PM   #6
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I stand corrected. I've never actually taken an internal wort temp so what do I know. I just based what I saw on the fact that my fermentation fridge is set for a certain temp and the fermometer is always a few degrees higher during active ferment. Guess I was closer to true fermentation temp than I thought.
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Old 03-23-2009, 09:18 PM   #7
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I trust. I have been starting my brews off colder than the fermentation range of the yeast, and when the fermometer warms to the low-end temp for the yeast is when I start to see a few bubbles and a tiny krausen.

 
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Old 03-23-2009, 09:58 PM   #8
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It's "close enough" for me to be happy. I've found that is usually within a degree or so when I've tested it so I stopped testing it. I mean, if the fermometer says "66", even if it's wrong by two degrees either way that's fine.
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Old 03-23-2009, 10:01 PM   #9
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There's going to be a 1 degree difference in temperature somewhere within the wort itself during the slower phases of fermentation when there is less circulation.
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Old 03-24-2009, 01:46 PM   #10
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I should probably use some of these... my first extract kit came with one that didn't work, but maybe that was because I had submerged it in water. I wrote them all off as crap and never tried again.
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