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im surprised at the lack of knowledge aquarium/terrarium owners have on these glass thermometers

Doesnt anyone know the contents of these thermometers?

I've asked in 3 different forums and nobody is 100% sure.

Maybe people dont use these anymore. :\ heck i wont be using them anymore. I just got my digital by Hagen and i love it.

The red liquid in the thermometer is Dyed Alcohol.

The balls are used to keep the thermometer up right.
But what exactly are the balls because i have busted a few lost the balls got out the glass i could find it's been a month since the first one broke and non of my fish are dead so it leads be to believe It won't effect anything however i could be horribly wrong
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