For negative, the aim LAD density reading is 0.90 1.45 1.55, and tolerance of our lab is +/- 0.025 for each number. For the print, the aim is 1.09 1.06 1.03, and our lab's tolerance is +/- 0.07 for each number I am just curious is that the same standard for all of world, or just our lab here. Liao