Mitutoyo 184-307S  Thickness Feeler Gage Set, Straight Leaves, 0.03-0.5mm Thickness, 100mm Length, 13 Leaves Measurement range of 0.03 to 0.05mm, 0.05 to 0.08mm, or 0.05 to 1.0mm Straight 13mm width leaf in 100mm or 150mm lengths Thickness marked on each leaf for convenient use Knurled locking nut holds leaf in place during use Integrated steel case protects leaves when not in use