When HN users recommended it
1 HN user recommended this in 2017, in one comment.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
1 HN user recommended this in 2017, in one comment.
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
Pretty small, but not cell-phone sized. https://www.amazon.com/MicrOptix-VSA-100-Analyzing-Spectroph...
Ones that detect particular contaminants can be a lot smaller, especially if they are single-use.