Optical fluid sensors Just received one of these optical fluid sensors after 2 months in transit.. No documentation at all, wondering what is the fourth wire for.. View on X → Share this: Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Share on Reddit (Opens in new window) Reddit Share on Facebook (Opens in new window) Facebook More Share on WhatsApp (Opens in new window) WhatsApp Share on Telegram (Opens in new window) Telegram Share on X (Opens in new window) X By Martin | May 22, 2020 | X post | ← Opinion != fact Power consumption to color indicator →
