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Amazon.com : Digital Aquarium Thermometer, Fish Tank Thermometer with Large LCD Display, Stick-on Tank Temp Sensor Ensures Accurate Reading, No Wires C/F Switch Aquarium Thermometer, Walnut Aquarium Thermometer : Pet Supplies
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Amazon.com: Digital Combo pH & Temperature Meter, Aquarium Thermometer pH Monitor with Automatic Calibration Function for Fish Tank Hydroponics Aquaculture Laboratory : Pet Supplies
![Help. So this is the second digital thermometer I've bought that says my tank is at 90F degrees. My top fin one has always said my temp is around 76-78F. Why is Help. So this is the second digital thermometer I've bought that says my tank is at 90F degrees. My top fin one has always said my temp is around 76-78F. Why is](https://preview.redd.it/kz8aqwkyion91.jpg?width=640&crop=smart&auto=webp&s=3536df6011977cc8d9a46c5013dd9b76081cb262)