The original manual calibration method was developed to verify proportioner performance through one brand of equipment and one model of gun when automatic monitoring was not available. The H. C. Fennell Consulting extension of that manual calibration method incorporates see-through liquid containers to make flow comparison, fast, visual, and intuitive, while using custom adapters to simplify the dispensing of side-by-side liquid streams directly from the wide variety of gun manifolds. Click here to see the how-to instructions for three Manual calibration methods.