The NTT-2100 water tank has a timer function and stir adjustment function, so you can choose the model that suits your use in a wide range of motion water tanks. The NTT-2100 model is used only in an aquarium, and there are many experiments in a row and the NTT-2200 model is suitable for those who have a lot of experiments using a large capacity in an aquarium, and the NTT-2400 model is suitable for high temperature experiments. Stirring adjustment. Effective when you want to reduce waves. Includes a standard timer function (auto-start and auto-stop) for improved work efficiency.