Lab Thermometer

SKU: 7409

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

Availability: In stock


Pic of 7409


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

Customer Reviews

Make sure you know how to use a thermometer Review by Up North
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. (Posted on 4/26/13)
Just like the ones at school Review by Gregory
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. (Posted on 7/31/12)
Meh, Consistent... Review by DMEasy
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. (Posted on 7/25/12)
Not accurate, don't buy Review by DudeFromBoston
As many others have pointed out, this thermometer is all over the place in terms of accuracy. Mine read 220+ in boiling water, since it's sealed you can't calibrate. Buy another one.

NB should really stop putting this in their starter kits. (Posted on 4/27/12)
Okay Reliability BUT Easily breakable Review by Chris
I've been brewing for about 2 1/2 years. I've had good consistent results with these thermometers. However, I'll soon be purchasing my fourth thermometer in that amount of time. These things will chip, crack and break if you look at them wrong. This weekend I broke my most recent lab thermometer. I was making a yeast starter and was taking a temperature reading as I was cooling the starter wort in my kitchen sink. The thermometer slipped out of my hand and dropped about two inches into my starter jar. The head cracked and it's contents (not mercury, but a petroleum based product) floated out into the starter. (Posted on 1/17/12)
Worked great Review by AndrewO
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. (Posted on 12/29/11)
Wildly Inaccurate Review by Alex
I wanted to check the temperature of a pot water to see how close I was to a boil. No bubbles were forming yet but the thermometer jumped right up to 220F. It was then I realized that my previous 2 mashes were totally off, and the beers are pretty undrinkable now. Do NOT buy this. (Posted on 10/18/11)
Not accurate Review by Kwaku1331
As previously mentioned it appears this thermometer is about 10-20 degrees cooler than other thermometers. Mash in this case reads 148 degrees on this therm. digital meat probe is reading 164. (I know this is too high, LOL) First time brewing all grain...need to tighten up the process. (Posted on 4/3/11)
Reads +12* hot during mash & +22* during boil Review by W
I've tried to calibrate this with the ice and boiling water method. In the ice bath I get and accurate 30F at 150 it reads 162 (bit of a difference when you're aiming for 150F and only hitting 140F).

At this point I only use it to keep track of how quickly the HLT temp is rising. (Posted on 3/16/11)
Hard to use Review by Deeboe
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. (Posted on 1/15/11)
Not Accurate Review by eeguy
I've tested this against two other thermometers and this one reads about 10 degrees cooler than the others. Not acceptable when mashing. (Posted on 1/5/11)
Not real accurate Review by dm
In a cup of crushed ice and just enough water to cover said ice, this thermometer reads 30F. In boiling water, it reads 217F. I've since purchased another lab thermometer that cost the same, but reads dead on. (Posted on 1/4/11)
As good of a thermometer as I've found so far. Review by Casey
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. (Posted on 11/3/10)
Good thermometer Review by Doug
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. (Posted on 7/30/10)
not accurate after 120 degrees Review by bouncingVman
The one that I have only seems to be accurate up to about 120 degrees then it is consistently cooler. It's about 30 degrees cooler at boiling water temps. (Posted on 3/21/10)