- Measure your gemstones and beads with this convenient caliper
- Units: Inches & Metric
- Maximum measurement: 3¼" or 80 mm
- Graduation: by 1/16ths and 1.0mm
- Resolution: 0.001" or 0.1 mm
- Material: Brass
This solid brass gauge offers a combination of inches and millimeters with notched jaws for taking both internal and external measurements. Has a smooth brushed finish and fine, crisply stamped numbers and lines. Measures millimeters and inches. Graduated in 1 mm and 1/16" increments. It measures up to 80 mm and 3¼".