Just what I need for my 4 gallon marine aquarium. It's the same as the more expensive AutoAqua Smart ATO Micro at half the price without the red warning light and horn that some find annoying. I like this sensor better than the micro sensor as it is easier to level the water between the two marks on the sensor. Installation was quick and easy, just make sure the one way valve is in your tank. Charging is now one less task every day. I just hope this lasts a long time.
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