Paterson Certified Thermometer 30cm 12"
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- Paterson Certified Thermometer 30cm 12"
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Easy-to-read calibrations, with an extended temperature range of 60-150F° (15-65°C) suitable for all color and black-and-white processes. Calibrations are 0.5°F (0.5°C), accurate to within ±0.25°. Includes a plastic storage tube.
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Note that I did search the internet as well, looking for some clues. There was no manufacturer's web site that was nay help.
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Measuring temperature to a tenth of a degree is problematic, and despite the above reservations, these thermometers remain about the best reference easily available. I recently bought two digital medical thermometers on Amazon, only to find that they gave different reading from each other and from my 'old faithful' digital that I have relied on for many years. These, like most digital thermometers, come with no specification of accuracy. The TTC 'Body Basal Thermometer' has high resolution with readings to a hundredth of a degree, but reads -0.6 at 37C compared to my old Paterson, and -0.3 compared to the new Paterson; not really good enough even for basic temperature checks, though for the intended purpose of fertility testing it is fine as only relative readings matter. It settles in about a minute. The 'Best' Digital Medical Thermometer, is much quicker to use, settling in about ten seconds, but reads -0.3 at 37C compared to my old Paterson, or correct according to the new Paterson. My 'Old faithful' digital, reads -0.4 compared to the old, and -0.1 relative to the new Paterson. What to conclude?! I really need a better reference, and also an accuracy specification at 37C. Basal body temperature is important for anyone suspected of sub-clinical hypothyroidism, but it turns out that while my typical body temperature of 36.3 might well be on the low side, I still have no way of truly knowing, and I wonder whether anyone else has!
I compare these thermometers by immersion in a washing-up bowl of warm water, with two thermometers close together, observing as it slowly cools while gently stirring (it cools quite slowly and needs very little stirring to ensure no temperature gradient. I recently discovered that a recognised reference for calibrating is the melting point of Gallium, and there is a good webpage on how to do this. Gallium is readily available online for 10 or 20 pounds, though I have not gone this far in my investigation. I have however contacted Paterson asking for their opinion regarding the discrepancy, and await a reply.