Feature: 1. Laser Engraved Line: This is micrometer with laser engraved line, which can be read clearly. 2. Slip Resistance Ratchet: This is micrometer with an slip resistance ratchet to prevent slipping. 3. Stainless Steel Material: The micrometer is made of stainless steel, which is hardened and ground to ensure durability and accuracy. 4. Basic Specifications: The micrometer is equipped with a calibration standard and a wrench. The measurement range is 0‑4in, and the measurement accuracy is 0.0001in. 5. Application: This micrometer is widely used to accurately measure length, diameter or thickness. Specification: Item Type: Outside Micrometer Material: Stainless Steel Measuring Range: Approx. 0-25mm / 0-0.98in, 25-50mm / 0.98-1.97in, 50-75mm / 1.97-2.95in, 75-100mm / 2.95-3.93in Measurement Accuracy: 0.0001in Use: Measuring the Outer Diameter of High Accuracy Products and Accuracy Parts. Package List: 4 x Micrometer 3 x Calibration Standard Tool 1 x Wrench 1 x User Manual 1 x Storage Box Note: 1. During measurement, stop using the knob when the micrometer screw is approaching the object to be measured, and use the fine tuning knob instead to avoid excessive pressure, which can make the measurement result accurate and protect the spiral micrometer.2. When reading, pay attention to whether the half millimeter engraved line on the fixed scale has been exposed.3. When reading, there is an estimated number in the thousandth, which can not be thrown away casually. Even if the zero point of the fixed scale is exactly aligned with a certain scale line of the movable scale, the thousandth should also be read as "0".4. Please note that the new type and old type of this product will be sent randomly,and make sure you will not mind before ordering.