Thermometers: What's the Problem with Accuracy? Featured

(PeteCresswell) posted for all of us...

Go to Cracker Barrel and look at the selection. (g)

Oren posted for all of us...

I liked the part about "The Importance of Probe Wipes"

dpb posted for all of us...

Try Fisher Scientific for those.

Mercury filled bulb type seem to be the gold standard that are used to calibrate the others but these are tested, lab grade, not chinese bulk goods. Paying more may not guarantee quality but paying less certainly says the quality is going to be a crap shoot because there is less quality control. The ice water deal is a good single point calibration but use distilled water for the ice and the water bath. Any dissolved salts will skew the results. We see that when we are calibrating our instruments. A tap water ice bath will typically be a little colder here in Florida but we have salt water intrusion in most of our aquifers. You might be fine up in those places where ther water comes from springs that are unaffected by mineral deposits or the sea.

On Sun, 04 Feb 2018 16:51:08 -0000, (PeteCresswell) wrote:=

Where on earth are you getting that s*it? I've got a digital watch (=A3=

-- =

Esplanade (v.), to attempt an explanation while drunk.

But it's stupidly designed. C is sensible: 0 is the freezing point of water, 100 is boiling point, easy to understand. Why don't you also use some weird base for maths, sorry math, instead of 10?

You're forgetting the IQ of Americans is considerably lower than any other country.

People actually pay to come and be close to the queen? Amazing. I guess they paid to see Sid Vicious too so I shouldn't be surprised.

Amazon will sell you a new Bacharach sling (wet/dry bulb) for $80 and they had used ones for around $50. That gives you temperature and relative humidity with a high degree of accuracy and you can use that to calibrate your other stuff. When I am calibrating my spa thermometer and thermostat I just use a regular fever thermometer since the range is similar.

Thermistor or RTD? A good RTD is fairly linear but thermistors need a lot of processing.

Warning: funny math symbols ahead...

During my brief career as a math(s) teacher I tried to teach weird base systems to 12 year olds. The A class (college bound) kids picked it up, the D class (Dummies) couldn't make change for a dollar in the decimal system let alone appreciate Sumeria sexagesimal calculations. But in this country everyone is equal so they are taught the same things.

You are forgetting Somalia -- and Scotland.

There are also linear solutions using the LM134 and similar.

Let's see. Round 22.8 up to 23; take 23, double it and add 30: 76. Close enough for jazz.

Cindy Hamilton

I often use base 16.

Cindy Hamilton

Sorry, I should have done that in the original post. The unit is from Lascar Electronics at

When I bought mine, you would get free cloud service for up to 2 sensor units. You had to buy the cloud service for more sensors or it you were recording real time data very frequently. But for 1 fridge, it was free. BTW, I noticed at my local Walmart Pharmacy they that one, or something very similar, on the fridge where they kept certain drugs like insulin. I don't know if it had logging capabilities or not.

Indeed...had a total of four excursions on that project, other than days spent on the boiler deck of a coal-fired power plant doing extractive sampling testing for determining relative coal flow distribution to each burner as the base data for research into developing a technique for online continuous flow measurement... :) That's hot and dirty business.

By pure coincidence happened to be near the castle one afternoon when there was "an appearance"...was able to take weekends during the testing duration plus we spent additional week to ten days after finished work stint and toured...

Thass the point; if have to do that, it's not inate...one has to consciously do the conversion. There are a few points almost everybody knows but even with those the intermediates don't "just come natcherly".

And 8 and 2 and for some encoding purposes 36...