General Tools 147 Digital Fractional Caliper with Extra-Large  LCD Screen, 3 Mode Display, 6-Inches EXTRA LARGE, EASY TO READ TRI-MODE DIGITAL DISPLAY - The Fraction+ Digital Caliper switches between inches, millimeters and fractions at the touch of a button. RUGGED STAINLESS STEEL DESIGN - has heavy duty housing and delivers inside, outside, depth and step measurements PRESERVE BATTERY LIFE - with the Digital Caliper's auto on/off feature Resolution 0.0005" (0.01mm), Accuracy 0.001" (0.02mm) INCLUDES: Power Source: SR44 battery, Foam Padded Carrying Case, 1 Year Warranty