Random pic of the day thread

Bought these - dropped them in my sump for a quick Read on temperature and salinity using a hoop and suction cup to keep in place. Much much easier than getting out the refractometer!

5 and 1/2 bucks in amazon. Added bonus of no moving parts and recalibration is really just cleaning it. Little green mark range says you’re good but you could get out the sharpie and put that line where ever you want.

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