does what it is supposed to.keeps my tank at the temp that it is supposed to be
I find my fish tries to move the thermometer around, so I but some stones around the bottom to hold it in place
*****
update
after 6months the bottom of the glass thermometer let go and the steel bb's came out,
filtering out the hundreds of tiny bb's was easily done with a small magnet,
a replacement thermometer I picked up a a local pet co and it looks the same except it has rubber coating the bottom of the thermometer, must have become a Known issue
so I would recomend the rubber bottom coated one
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