Quantity: One Piece The highest quality standard: Fine polished stainless steel frame stirrups with knurled rollers and locking screws to ensure smooth and precise positioning during use. Using hardening process, no rust, more durable and longer service life Accurate measurement: The digital caliper can measure up to 6"/150mm with an accuracy of 0.01mm. This allows you to zero at any point on the scale and start a new measurement, with just one click in inches/mm Switch immediately between one button, extra large has 4 measuring functions of inner diameter, outer diameter, depth and scale Large LCD display: Digital caliper, large LCD display, clearer readings. The reading can be displayed in inch or millimeter format. Dust and oil resistant Versatility: This professional digital caliper measures inside, outside, depth and step using two sets of jaws and sensors; using the zero button, we can reset the value during the measurement process, making it more flexible to use. A digital counter with automatic on/off function ensures that your battery will not run out upon arrival. Highly recommended for home and professional use. Good quality product.