Instant reading. Very easy to use. Hardened stainless steel body for prolonged tool life. Switches from inches to millimeters with the touch of a button. Range of 0-6?/0-150mm. Accuracy + / - 0.001"/ 0.02mm. Resolution: 0.0005?/0.01mm. Large easy to read numbers reduces error - no guessing. Adjusts to zero at any position. Measures internal external depth and step dimensions. Jaw depth measures 1-1/2? outside 5/8? inside. Lock holds slide in position for measuring constants. Battery included. Low battery indicator. Fitted plastic storage case. Imported.