Simply put, this is the best brine shrimp hatchery on the market. You may be thinking "how much better could this be over a 2 liter bottle?" When you hatch live baby brine shrimp every day, the construction and thoughtfulness of this design won't go unnoticed. All of team Aquarium Co-Op use and love this hatchery. It is made of super strong plastic to withstand an impact and has the option to run a heater and thermometer in it. We highly recommend running this brine shrimp hatchery with our USB Air Pump.  Note that the provided thermometer is in Celsius.