The 147-6 inch steel digital caliper has an extra-large, easy-to-read tri-mode digital display and switches quickly and easily between decimal inch, fractional inch and millimeter at the touch of a button. Ideal for professional and do-it-yourself projectsBar scale is graduated in in. and mmHigh contrast digital display switches easily between inch, millimeter and fractionsAccuracy to 1/1000 inchProvides inside, outside, depth and step measurementsBar scale features etched, black graduations in in. and millimeterAutomatic On/Off feature preserves battery lifeResolution 0.0005 in.Accuracy 0.001 in.Auto on and off feature preserves battery life