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Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > What Thermometer can i trust?
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Old 12-04-2009, 11:50 PM   #1
cpbergie
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Default What Thermometer can i trust?

I currently have two thermomters. Your basic Thermoworks and a CDN Quicktip.

I calibrated the CDN in crushed ice with water and tested them both and they both read 32. Today I brewed and measured the mash temp, the Thermo read 156 and the CDN read 153. later when i tested the OG of the wort, i took another reading and the Thermo read 68 and the CDN 67.

I guess these aren't that far off, but im not sure which thermometer to trust and im not sure if i mashed at 153 or 156. I was really hoping to nail down my process and the temp of the mash seems to be a variable.

Any ideas or should I just RDWHAHB?

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Old 12-04-2009, 11:57 PM   #2
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Ethanol and water boils at 172F at sea level and you're probably close. A much better calibration point for mashing.

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Old 12-05-2009, 12:02 AM   #3
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get a lab thermometer. They are only $6 at my LHBS but its the only thing I trust anymore. I broke it the other day while transporting my brew gear, but at $6, its nothing I am going to loose any sleep over.

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Old 12-05-2009, 12:11 AM   #4
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I just got one of these at TJ Maxx for $13.00 http://www.oxo.com/OA_HTML/xxoxo_ibe...4&respid=53057

I tested it in ice water and it was spot on.

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Old 12-05-2009, 12:22 AM   #5
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Both of mine seemed spot on in ice water too. Are the floating thermometers as reliable as the lab thermometers? I have one of those.

I guess ill test them both again with boiling water. im only about 500 feet above sea level.

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Old 12-05-2009, 12:39 AM   #6
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I have three Taylor's They are almost perfect, I have one that reads 1 degree high and one that reads 1 low. I put all thee in ice water and brought it to a boil they stayed consistent through the entire time 0-212 with the other two reading 1 high and low across the entire range

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Old 12-05-2009, 03:12 AM   #7
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Ice bath temp should be 34F as it is changing phase.

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Old 12-05-2009, 03:14 AM   #8
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Ice bath temp should be 32F as it is changing phase.

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Old 12-05-2009, 03:28 AM   #9
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Quote:
Originally Posted by david_42 View Post
Ethanol and water boils at 172F at sea level and you're probably close. A much better calibration point for mashing.
+1. All of you ice calibrator folks should keep this in mind. Why focus the precision near freezing? Mash is at 150 or so. If you don't do ethanol and water, boiling water calibrations are still closer to intended mash temps.
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Old 12-05-2009, 04:09 AM   #10
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What mixture of ethanol and water would one use? Also, how would you figure in altitude to the 172°F?

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