Calling aspiring engineers: Build your own particulate matter air sensor with EPA’s kit and step by step guide: http://1.usa.gov/1MB1k7c
2:35 PM - 24 Apr 2015
1 reply
20 retweets
21 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.