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Lab Thermometer


SKU# 7409

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All-purpose glass thermometer, reads in 2° increments).


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Product Details

Our favorite all-purpose thermometer. Reads in Celsius and Fahrehneit (-20°-110° C, 1° increments; 0°-220° F, 2° increments). Takes readings quickly.

Additional Information
Support Documents:No
2.9 / 5.0
18 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Make sure you know how to use a thermometer
A lot of the negative reviews of this thermometer complain about accuracy. Mine was fine. I can't help but guess some of this may be related to people not knowing how to use a thermometer. I know that sounds goofy, you just stick in the liquid and read it, right? Well, not really.There are two main types of glass/alcohol thermometers, partial immersion and total immersion. The one I got from NB was a partial immersion, but I'm not sure that's always the case; the one pictured in the on-line catalog appears to be total immersion. Partial immersion thermometers will have a line, usually about three inches from the bottom. This is the immersion line, and it marks how deep you put the thermometer into the liquid to get accurate readings. Total immersion thermometers should have printing on them to label them as such, but sometimes they don't. If it isn't marked, but it doesn't have an immersion line, it's probably total immersion. Total immersion thermometers have to be immersed in the liquid as far up as the liquid temperature reading -- i.e., if the water is boiling, the thermometer needs to be in as far as the 212 F mark, or it will read low. There are correction factors you can apply if you can't put it in that far -- Google it if you want to learn how, it's a simple formula. A total immersion thermometer will read several degrees low if only the lower couple inches are in the liquid.Partial immersion thermometers can read incorrectly even if they're immersed to the line. The reason is the calibration assumes the part of the thermometer that's not in the liquid is in room temperature air, which it's not if it's in the steam over boiling wort. This is why total immersion thermometers are generally more accurate if immersed properly. However, the correction for partial immersion thermometers is not huge, so just immerse it to the line; you can get a sense of the error by putting it a pot of boiling water (preferably your brew pot). Wort boils at a slightly higher temp than 212F because of the sugar content. If you're measuring temps close to room temp, then this error is minimal.As far as breakage. . .yes, glass thermometers are fragile, big surprise. I can't see why people complain about it. If you want a thermometer you can bang around, get an electronic or steel shaft thermometer.This thermometer is a perfectly good example of what it is -- a glass thermometer. It has to be used correctly to be accurate. And it's not a stir stick, not matter how tempting it is to use it that way.
April 26, 2013
As good of a thermometer as I've found so far.
Accurate, surprisingly tough. Mine has survived being dropped many times, being used as a stirring stick in the mash. Reasonably fast response, easy to read. Just a good basic piece of gear.
November 3, 2010
Worked great
Worked great until I forgot it was sitting on a the top of a tote and I forgot to remove it before I opened it. I will probably upgrade to a digital or dial one instead, but it worked great.
December 29, 2011
It's glass don't break it.
Good response time and accurate. But it's glass so handle it as such, this is my second one.
June 7, 2017
6 months ago
Dead nuts on!
I have a mortal fear of broken lab gear. I have to have at least two of everything. I bought this, and tested it against my cherished Chico thermometer. It passed every test...
January 22, 2017
9 months ago
Just like the ones at school
Had a lot of experience with this type at school, I didn't think to check the calibration, however it did show the boiling point at my elevation (6200') at 198(deg)F, which is about correct without considering barometric P. We must remeber there are many variables with boiling temps, sugars, ions, and additives can increase the boiling temp of a liquid. Angle of view can greatly skew the reading of this type of thermometer, the eye should be level with the reading. I think mine works fine, but I am going to outfit my pot(s) with a dial face thermometer for ease of use anyway.
July 31, 2012
Good to have
Hard to beat old school thermometer
March 2, 2016
Good thermometer
The one that came with my kit is fast and accurate. Unfortunately, I droped it. It didn't break, but the red fluid (mercury?) inside has separated out just a bit. It still works, but I'll replace it with a new one.
July 30, 2010
Meh, Consistent...
Reads 4 degrees warm whether in boiling water or ice. At least it's consistent in its inaccuracy. Test your thermometer after buying and adjust your temp. targets accordingly.
July 25, 2012
Hard to use
I have a hard time with this one. I noticed when doing a reading that, no matter where my fingers were, it affected the reading. I have since tied a string to the end of it that I hold when doing readings. Still, a major pain.
January 15, 2011
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Browse 2 questions Browse 2 questions and 3 answers
How long is this thermometer? Diameter? 1/4" ish?
W P on Jan 31, 2016
BEST ANSWER: This thermometer is 12.2" long, and less than 3/8" in diameter. - Mike W , Northern Brewer
Is there mercury in this thermometer?
A shopper on Jan 16, 2017
BEST ANSWER: No. The liquid inside the bulb and capillary is made out of ethanol. Alcohol-based thermometers are the standard today for glass thermometers because they are cheaper to make than mercury-based thermometers and obviously less toxic.

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