The AZ-0001 Co2 meter. Vendor of a CO2 meter with zero to 2000 ppm co2, 30 or 50 ppm accuracy, serial data output, humidity, and temperature. The meter appears on a big name cheap sales website for a little under $200.
One problem with the yellow AZ-0001 CO2 meter is the meter has to be manually restarted if the 9 volt input DC power is interrupted. A second problem is the CO2 value is quite sensitive to my breath when the meter is running on the garage workbench. For outdoor readings the mechanical problem is to put the meter at least 8 feet away from passing humans and also have the meter accessible for restarting.
The same vendor sells a hockey puck device which I have also used. I stopped using the hockey puck due to it's humidity measure device. That was about 4 years ago.
Contact me for a copy of my Python CO2 meter software. The output of the software is lines of unixtime, GPS position, CO2, humidity, and temperature. leemck at gmail dot com.
My CO2 interest is in the global excess CO2 problem.
About fiften years ago I was reading child development books. I discovered this wonderful thinker Jean Piaget.
I think Piaget's first book translated into English caused a great deal of excitement, especially at the University of Chicago. Piaget's book "The Language and thought of the Child" I conjecture was the inspiration for organizing a school around a great books list and also for teaching mathematics by the demonstration and discussion method.
At St. John's the freshman math tutorial meant each student stood up, drew a triangle, lettered the corners, and recited the proof and discussed and explored the ideas and assumptions.
For myself at St. John's the great books seminar became a very slow process of analyzing and trying to restate writings. By the end of the Junior year, my final academic review called a Don Rag I can say It Did Not Go Well ("what happened Lee?").
Regarding the math side of things, a few years later I got a technician job at Cal Tech and I was allowed to enroll in Cal Tech a calculus class. By November I was dreaming of flying, I swooped on updrafts of assumptions and bold substitutions and clever identities.
I couldn't solve the winter mid term exam problem but to this day I am grateful that I saw and did the two extremes of math.
These days, I don't do much Calculus, but I do and think about knot theory and coiling. I keep stumbling across pi/2 as I coil or fold air hoses or ropes. Why must three utility pipes connecting to three houses cross? Why are the computer wires always a tangle"?
Regarding the Great Books, I recommend the Meno and then the Socratic big 5. These books are still a source of puzzlement to me.
A final question: What happens in the brain when a student stands up and does a proof at the black board? Why do opera singers stand up to sing? Why is standing up to walk a neurological milestone in the development of the child?
The genius of the printer business is printers can be programmed to fail and become unrepairable without breaking the law.
Once the warranty period of the printer expires, it is not illegal withhold the service manual for a printer. It is not illegal to withhold the electrical schematic or operating temperature specification of the fuser. It is not illegal to withhold the details of the toner chemistry. It is not illegal to withhold the printer programming language specification.
It appears to me that what is going on in the printer business (and the automobile industry too) is a deliberate push to make cars and printers consumer items.
The other side of the printer business is a inkjet or laser printer ought to be able to work for 40 years. A little distilled water soak ought to fix any clogged inkjet. A couple rollers ought to fix any paper feed problem.
One answer to Why is the printer industry so scammy is Consumerism in America is now in decline. Many commentors here, just like me have thrown a pile of printers in the trash.
The last 30 years of printers that turn in to garbage is an irretrievable waste of potentially beautiful machinery.
Good question you ask. Many good comments, thank you other posters.
First comment is allow more time for things you want to recall to appear.
Second comment is I got a small benefit by taking vitamin B12. Set up a note sheet, take some vitamin B12 the night before you want to remember something and write down the results.
Along those lines, I mention Daniel Khaneman's book Thinking Fast and Slow.
I suggest you study the phrase 'memory impairment'and until you find a much better phrase. A second book I recommend is Norbert Weiner in Cybernetics Command and Control in animal and machine". He proposed that the human brain differs from computers because the memory more or less lasts for the life of the human. In computers, the memory is reset.
https://www.co2meter.com/collections/handheld/products/az-ha...
One problem with the yellow AZ-0001 CO2 meter is the meter has to be manually restarted if the 9 volt input DC power is interrupted. A second problem is the CO2 value is quite sensitive to my breath when the meter is running on the garage workbench. For outdoor readings the mechanical problem is to put the meter at least 8 feet away from passing humans and also have the meter accessible for restarting.
The same vendor sells a hockey puck device which I have also used. I stopped using the hockey puck due to it's humidity measure device. That was about 4 years ago.
https://lessco2essay.blogspot.com/2015/08/carbon-dioxide-met...
Contact me for a copy of my Python CO2 meter software. The output of the software is lines of unixtime, GPS position, CO2, humidity, and temperature. leemck at gmail dot com.
My CO2 interest is in the global excess CO2 problem.