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If you’re an engineer and are looking for a major time commitment of a hobby, you can probably get a used 8020A up and running in half a year using just eBay. 1/n 
You could set up a pair of machines and do some statistical analysis to make sure you’re confident in the results. If someone from #8020Agang is in your area, it’s a mad scientist meetup! 2/n
The only part you can’t get on eBay are probe installers, which I make for free for people who have already gotten an antique machine working. They’re pretty simple to make with ring magnets but I’m picky about tools. 3/n
It’s called #8020Agang because at the moment, 8020A is the “cheapest”, most practical model needed for an engineer or science-inclined person to start teasing out what’s happening with filtered air - whether the air is in a mask, school, car, hospital, factory, wildfire etc.
4/n
4/n
People are scared away by old timers bringing up pricetags like “$30,000 per machine”. Someone got a good chunk of a kit for $50. I’d say that for someone who is reasonably well-read, there’s an 80% chance that a $1000 kit total can useable readings. 5/6
The people that brag about spending tens of thousands on single machines usually don’t give out machines to measure air in their communities or to check manufacturer claims about devices that aren’t related to OSHA. Almost every room on Earth is untested.
6/6
6/6
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