Accurate measurements ensure a smooth roller blind installation with a perfect fit. For Inside Recess Roller Blinds, measure the width and drop at three points within the window frame, selecting the smallest measurements to account for unevenness. For Outside Recess Roller Blinds, measure past the frame for full coverage, minimizing light gaps while enhancing style and function. Use a metal tape measure, note measurements in millimeters, and verify accuracy. This guide simplifies measuring for inside or outside recess roller blinds, ensuring seamless operation, improved privacy, and a refined aesthetic.