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Which brand of digital thermometer is the best?   


Kevin Zhang www.9020arab.com
@Kevin · Posted 16 Nov. 2020


Kevin Zhang www.9020arab.com
@Kevin · Posted 16 Nov. 2020

Temperatures influence almost every property that a material or component can have: volume, electrical resistivity, emission spectrum, magnetic permeability, dielectric strength, polarization, even color/reflectivity in some substances!

This allows, depending on what property you based your measuring system on, for a huge range of thermometric devices (that's engineerish for thermometers) to be developed: alcohol thermometers, mercury thermometers, pyrometers, bi-metal thermometers, thermistors, thermo-couples, resistance thermometers, silicon band gap temperature sensors just to name a few.

The focus here is home use so I'll concentrate on measuring body temperature.

Since temperature is a local transient property, [math]T=T(x,y,z,t)[/math], is it a difficult parameter to evaluate. We would like a reassuring single short answer to the classic "What is the the temperature?". But we really measure what the temperature is in that point in space and in that moment in time. You move a little bit more to the left and you measure another temperature. A bit to the right and a slightly different temperature. A morning breeze comes in when you open the windows and, again, another temperature reading. Since temperature is a such a space and time varying measure, the more sensible a measuring instrument is, the higher will the oscillations be. I had the insane idea of wanting to measure an extremely transient temperature once (from 25 to 800°C in 10 ms) with a thermo-couple. I got myself a very very thin small thermo-couple (something like 5-10 microns thick) to reduce thermal inertia and the result was that I could see the effects of my own breathing if I was too close. (Take note: beware of fast instruments). Ah I also have two children (now 9 and 6) so I know what a mess measuring their temperature can be and how much you can worry when you don't have the number at hand to tell the doc on the phone.

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