electronic thermometer

I use 3 different thermometers in my tanks: a ($20) Lifeguard Little Time digital, a ($10) Coralife digital and a ($2) Plen-Plax alcohol thermometer. All of these read within .5°F of my old Kodak mercury thermometer that I consider to be a standard.
As far as safe ... what do you mean? ????

:santa:
 
Puzzled of Humlebæk : why would they not be safe? I don't understand your question.
 

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