Made for calcium reactors, denitrators, gradual water changes, or any other fluid that you need to continuously transfer to your aquarium. The Kamoer FX-SP is compact and quiet, but the biggest feature is the ability to change the flow rate while it is running. You can change the flow anywhere from 1mL/min all the way up to 120mL/min depending on your application. High Precision Stepper Motor. Easy to Calibrate. On-Board Memory. Best Solution for Calcium Reactors. 125mm (h) x 83mm (w) x 133m (d)