Peckham
Hello everyone,
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I recently treated myself to the ADOX precision thermometer.
Today I had a bit of fun and compared it with my Jobo Color thermometer.
Unfortunately, I found a 2°C difference in temperature.
18°C on the ADOX, 20°C on the Jobo.
Which thermometer would you trust now?
The room thermometers I usually use aren’t much help for further comparisons.
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Thank you very much for your interest
Peter
Rolf-Werner
If you measure it, you're measuring rubbish! :)
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Put a few ice cubes in a glass of water and give it a good stir. That should be pretty much exactly 0 degrees. Wait 10 minutes, then compare the readings...
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Whenever I’ve had to buy a thermometer for outside or the fridge or something like that, or even a meat thermometer, I’ve always compared several in the shop and gone for the one that showed exactly the average reading.
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I’d be interested to see what your experiments turn up, as I was thinking of ordering one of those myself.
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Regards
Rolf
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I saw a digital meat thermometer at Müller the other day; it even had one decimal place and a measurement range suitable for cooking. But I’d like to know how accurate it is, because just because it’s digital doesn’t mean it’s calibrated any more precisely than your two analogue ones.
Peckham
Hello Rolf,
Thank you very much for your reply.
Your suggested experimental setup sounds really good. When I tried to give it a go yesterday evening, I unfortunately realised that the thermometers’ measuring range is only between +10 and +50 °C.
I suppose I’ll have to have a look around to see if I can find somewhere to compare it with a calibrated thermometer.
Best regards,
Peter
CD43
Hi Peter,
I have the same thermometer. After it fell over once, it started showing 3 degrees too low, even though it looked perfectly fine.
The fall caused the scale to become misaligned with the needle. Perhaps yours took a knock too?
Best regards,
Gregor
Magirus
Hello Rolf,
I have several thermometers and the difference is quite interesting.
The ADOX thermometer is somewhere in the middle and is my first choice simply because of how easy it is to use.
As I also process C41 film, I’ve noticed that the difference varies between 20° and just under 40°.
Calibrating at 0° isn’t exactly ideal; I’m talking about alcohol and bimetal here.
I’ve got an HQ meter as well, but the ADOX is easier to read.
Regards, Bernd
sputnik
I’m always happy to recommend the GTH175PT from Greisinger.
It responds quickly and is extremely accurate.
It’s also robust.
A purchase that will last a lifetime.
https://www.greisinger.de/files/upload/de/produkte/bda/GTH175PT_d.pdf
Peckham
Well, I’m not the only one with this problem, then.
I think I’ll take Sputnik’s advice. According to the description, the device is apparently even suitable for calibration.
And a quick-reading thermometer does have its advantages, too.
Many thanks for your replies.
Best regards,
Peter
wosis123
I couldn't agree more; I use Greisinger too.
Bonderer
I used to have an old Hama digital thermometer and swapped it for a Greisinger; the Hama was too old and was falling apart. I once had the chance to compare all three using a laboratory thermometer – not for a photo lab, but for a chemistry lab. The difference between all three was very small. And the Greisinger responds very quickly to changes in temperature. You can get 9V block batteries everywhere, and they last and last and last.
Peckham
I must admit that I’m still finding it hard to justify spending so much money on a thermometer.
I’ve had another closer look at the ADOX thermometer and, lo and behold, there’s a nut on the back that lets you calibrate the whole thing. Right, now I just need a thermometer to use for the calibration. But I’ll manage to find one.
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Thanks again for your replies!
pikespeak
It doesn’t necessarily have to be the one from Greisinger, and a Pt100 should also be sufficient for the purpose.
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Other manufacturers should also be able to achieve the 0.1% ±2°C specification.
Personally, I use a Pt100 from Jumo, 4L, with an old Esters display.
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In principle, thermometers – especially bimetallic thermometers available for domestic use – are more of a hit-and-miss affair.
The question is always whether it is accurate enough for the application.
Renate
Hello,
I find the note about the cap on the ADOX thermometer quite helpful. After dropping it, mine was showing a clearly incorrect reading. It’s actually really easy to correct. The thermometer is accurate enough for developing black-and-white film. Many digital thermometers give the impression of a level of accuracy they don’t actually have. Mercury thermometers are very accurate, but they’re quite toxic if they break.
Best regards,
Renate
HGR
Hello,
If you measure too much, you’ll end up with rubbish!
The two digital thermometers read 25.8 and 25.9 degrees respectively, the glass thermometer shows 28 degrees,
and the bimetallic thermometer… well.
I recommend the digital thermometers; I keep one in the lab, and I always take the other one (from Reichelt)
with me to wine tastings, because red wine: from 15 degrees and then taste it slowly.
Best regards,
Hans-Gerd
sputnik
What a lovely blanket! :wub:
HGR
Now I’ve noticed it too. The ceiling does actually look more like a wine tasting room than
a darkroom. Tml.
sputnik
Don't mention it – I didn't mean that ironically! Just looking at it makes you feel as safe and cosy as in (or perhaps better said, on) Grandma's lap. :)
Urnes
Although the ADOX meat thermometer does go rather well with the tablecloth. :spudniksailor:
sputnik
Absolutely!
Even when it comes to taking a rectal temperature, the ADOX is probably unbeatable from an aesthetic point of view. :-()
Olivinyl
Absolutely!
Even when it comes to taking a rectal temperature, the ADOX is probably unbeatable from an aesthetic point of view. :-()
</QUOTE>Uhhhhhhhh........ Now it’s getting a bit icky. However, it’s important to thoroughly remove any residual fixer before rectal use. The silver introduced into the rectum in this way can cause immediate destruction of the intestinal flora.
Best wishes, Oliver
Urnes
I’ve been using old Agfa swimming pool thermometers for decades now. I’d guess they’re alcohol-based. The only important thing about the whole thing is that the thermometers are consistently ‘off’. If you always use the same thermometer, which consistently reads 1° higher, after the first test of the film (in my case, just a visual check), you’ll say, ‘OK, I’ll add another minute’, and that’s how you work under the same conditions for the next 10 years.
Regards, Sven.
