INSIZE Vernier Calipers Specifications Include... Measuring Range: 12" Graduations: 0.001" Accuracy: +0.002" Internal Jaw Width: 0.5" Jaw Depth: 2.953" Minimum ID Measurement: 0.550" Features include... Satin chrome finish on all models. Hardened stainless steel throughout; ground and lapped for accuracy. With Fine Adjustment