INSIZE Vernier Calipers Specifications Include... Measuring Range: 40" / 1000mm Graduations: 0.001" / 0.02mm Accuracy: +0.0031" Internal Jaw Width: 0.8" Jaw Depth: 5.512" Minimum ID Measurement: 0.850" Features include... Satin chrome finish on all models. Hardened stainless steel throughout; ground and lapped for accuracy. With Fine Adjustment