with metal housing cover and metal buttons mechanical components made of stainless, hardened steel with or without a knob (included for customer installation if needed) large LCD display with clear readings, 9 mm high digits accuracy 0.01 mm / 0.0005" measuring tips precision-ground and lapped ON/OFF button with depth gauge unit of measurement in mm or inches, can be zeroed in any position includes 2 3 V batteries (type CR2032) packaged in accordance with UN 3091, Class 9 in a plastic case