The Teejet 844 Sprayer Control offers spraying advantages not found in other controllers. Designed with simplicity in mind, computer-controlled spraying has never been easier. Just set your desired rate and the VisiFlo display helps you select the correct Teejet tip for the job. Once spraying begins, the Teejet 844 maintains the set rate and the large display shows the applied rate, volume sprayed, speed and area covered. The Teejet 844E is available as a complete kit with valves or as an individual controller to match up to your existing electric valves.