NEEWER® Digital LCD Fish Aquarium Water Thermometer

• Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water)
• Temperature Range: -50 °C ~ +70°C
• LCD display
• Powered by 2 x LR44 button cell (included)

It does the job but that's it. It is what is says it is but if you prefer Fahrenheit then look elsewhere. There is no way to attach it to tank but it is easy enough to buy some Velcro and stick it on. I would have bought another one had I known upfront it was Celsius only.

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For less than $4, can't beat it. Reads within 1 degree of other temperature monitors that I have. Keep in mind that it reads In CELSIUS only.