The Leneta Logicator is a geometric-sequence, multi-notch applicator, designed for rapid visual hiding power measurements. It conforms with ASTM Method D 5007, Wet-to-Dry Hiding Change. In this standard, the hiding power of the wet film and then of the dry film are observed visually, and the percentage increase or decrease is reported. The Logicator Chart consists of Form 9B Opacity-Display Chart with a plastic laminated header overlay designed specifically to compliment this applicator. Form 23B has been discontinued.