Product Description Sag Index used to determine the level of Wet Film Thickness of Paint Film. It will help to evaluate visually for sag resistance of coating. The instrument is commonly used in laboratories for quality control and experimental purposes for various fields like Paint, Ink & Powder Coating Industries. Our range is available with seven pairs of gaps for leveling assessment 50, 75, 100, 125, 150, 175, & 200 micron.