Marina Aquarius Thermometer, 72-86 Degrees Fahrenheit

I got this thermometer for my first 10 gallon tropical aquarium. It works fine for seeing if the temp is in the proper range (74-82) but is not good if you want a precise reading. One square represents about 3 degrees and there are usually 3 squares lit up (the middle one being the brightest).

Even after several hours, this thermometer remains black (see my customer image). The tank's heater is set for 82°F for my betta and I wanted to make sure the heater was accurate. I like the small design, but this thermometer is useless.

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This thermometer, like many stick on thermometers, works by color range. The problem is that the color range is all close in color, so it's a bit difficult to tell precisely which temperature block it has settled on.

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I have perfect vision and not colorblind. However, when I look at this thermometer, I feel like I suffer from both. Basically, it's unusable. The ATI thermometer works well and is visible.

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Not much to say, it does what it's meant to and it's nice and small for small tanks. Accurate as far as I can tell.