Wiha 41105 inch, dial-max caliper. Non-metallic high tech material with 60 percent fiber glass content. For outside, inside, depth and step measurements. Impact resistant dial can be recalibrated to zero. Swiss Precision from Wiha Division KWB Switzerland Non-metallic high-tech material with 50% fiberglass content ESD-Safe Dissipative Material Ideal for Small Delicate Parts Thermal Stability Short Contact 180C - Continuous 100C Chemical resistant- organic solvents, alkalis, & petroleum products Inch Dial-Max Caliper .001" Resolution to 6" Length Bi-directional Thumb Roller with Friction stop Bezel Rotation Allows for Quick Realignment to Zero Does Inside, Outside, Depth and Step Measurement Super Light Weight For All Day Non Fatigue Handling