MyQul
Chairman of the Bored
Are these accurate? Just tested my cheapo fleabay probe one and its out by 0.5 at the top and 2.5 at the bottom end. It used to be out by 0.8 at both ends so I could use it but it's going to have to be binned now.
I have seen this mentioned, but I can't remember who (MM maybe)
http://www.ikea.com/gb/en/catalog/products/20103016/
At �ã7.25 it's my next buy when I find myself in an Ikea.
I think you need one of these...
https://www.thermometerspecialist.c...-with-115mm-probe-and-calibration-certificate
Damn, if only they did them in black....
........ to re-calibrate the scale that is on it, .........
I inherited a great thermometer from my brother when he died.
It's a Fahrenheit thermometer and spot-on for accuracy from 32 to 212 degrees; but it is so old that the black numbering has disappeared!
By the time I read the temperature from the numbers engraved on the stem it isn't representative any more, so any ideas as to what I can use to permanently reinstate the numbers without poisoning myself?
PS
It's lasted so long because it sits in its own chrome-plated brass container. Must have cost our Joe a mint when he bought it sometime around 1960!!
That is an interesting one, right enough. The easy one is to see where boiling point is using water vapour from a kettle. Then it must be possible to establish the "triple point" of water at 0C. Since it is a basically sound instrument you can make the assumption that the correct scale in between will be roughly linear.
(Linear just means that 50C is half way between 0C and 100C on the thermometer, and so on.)
How you would re-mark your instrument is beyond me, I just know something of the physics. The place to ask the question may be on the General Beer Brewing Equipment Discussion part of the forum.
If the device is just for brewing you might only need a few markers. Say, 20C for pitching indicator, 65C for mashing indicative reading, 80C for sparging sort of temps. Something like that?
What's this "triple point" then? (please explain in laymans terms)
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