Fine adjustment thumb roll for precision measurements Rounded nose scriber cuts clean, sharp lines with smoothness and less pressure Lock to hold the slide in position Hardened, ground, and lapped base with finger grooves provides ease of movement Easy access to single long-life battery Vertical bar is back from the edge of the nose for better stability Scriber can reference zero from the bottom of the base to get the full 6" (150mm) usable range Inch-millimeter conversion Zero at any position Features a manual on/off button plus automatic turn off after 5 minutes of inactivity Optional depth attachment PT08680A available for measuring depth of holes, slots, and recesses (sold separately) Plastic case Resolution 0.0005" (0.01 mm)