ESD Safe Dial Caliper Metric 150mminSwiss 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 180ºC – Continuous 100ºC Chemical resistant to organic solvents, & petroleum products Metric Dial-Max Caliper.01in Resolution to 150mmin Length Bi-directional Thumb Roller with Friction stop Bezel Rotation Allows for Quick Realignment to Zero Inside, Outside, Depth and Step Measurement Light weight for all day fatigue free handling