pileofstuff | testing an alcohol tester - drinking for science! @pileofstuff | Uploaded May 2022 | Updated October 2024, 5 hours ago.
How good is a cheap breathalyzer type device?
And does it work any better than a homemade one?

Let's test this $3 one I got in a recent mailbag.

(spoiler: I overpaid for it...)

Here's the datasheet of the sensor I used in the DIY version: components101.com/sites/default/files/component_datasheet/MQ-3%20Sensor%20Datasheet%20In%20Detail.pdf
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This isn't the only way to do it.
It's probably not the best way to do it.

But it's how I do it.