I think they are worth the money, much easier to read than the old fashioned tank style floats and sidebars and I find them accurate too. Because I checked the old fashioned float types and they were the same temp I think they are worth the money and a lot easier to manage. The included suction cups seem to stick very well both inside and outside the tank and I really love the fact that you can switch from Fahrenheit to Celsius. I think everyone should have these in their hobby aquarium.
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