This Strong Plastic Caliper Duo Is Perfect For Both Large And Small Jobs. The Little Caliper Measures Up To 3". Small Enough To Fit In Your Pocket! Measures Both Inside And Outside. Can be used for science project and classroom use. Perfect for learning how to use calipers! The Large 6" Handy Plastic Caliper Can Measure Both Outside And Inside Depth. Small And Lightweight, It Will Fit Easily Into Your Toolbox Or Tool Belt. Great For Precision Measuring Work.Used to measure gemstones, beads, jewelry making, also an essential measuring tool for lab school use.

* For 6" -- 0.05mm 1/128 Inch Accuracy , Resolution: 0.001in. & 0.01mm

*For 3" -- Maximum measurement: 3.25 inches or 80 mm, Precision: 1/128 inch or 0.05 mm

* 0.05mm 1/128 Inch Accuracy

* Comes in a Blister Pack

* Lightweight Plastic