Brass Calipers (Inside and Outside) **Used for making both internal and external measurements. **External measurements can be made from 0 – 4 (0 – 100mm) whereas internal measurements can be made from 7/32 (5mm) to 4 (100mm) • A handy pocket caliper made from solid brass. • Close tolerance dovetail design ensures smooth motion of the caliper and provides accurate measurements. • Graduated in both imperial and metric graduations with a least count of 1/16 on the imperial scale and 0.1mm on the metric scale • Ideal for use by mechanics hobby crafters etc. who need to take measurements on small objects such as nails screws lenses tubing etc.