These stainless steel calipers have a tri-mode digital display that measures in decimal inches, millimeters, and fractions and are ideal for accurate seed measurement or quick screen perforation verification.  The units feature a free-wheeling friction roller that advances and retracts the slide, bar scale is graduated in inches and millimeters, auto on/off, and includes on LR44/257 battery. 

Accuracy: ± 0.001" (± 0.02mm) resolution: 0.0005", 0.01mm, or 1⁄64".