Aluminum Alloy Digital Dial Indicator-- Large LCD Display with 3 Digits, Be Used to Accurately Measure Small Linear Distances in Mechanical and Industrial Processes without Reading Errors, An Ideal Tool for Mechanical, Industrial Processes and Laboratory Use 0 - 25.4 mm Measuring Range -- Measuring Range from 0 - 25.4 mm (0 - 1 inch), High Resolution up to 0.01 mm (0.0005 inch) Included Rear Cover-- Hole Diameter: 6.5mm, It is Removable and Can be Used on Different Magnetic Base Holder Stand Inch/Metric Conversion-- Switchable between mm and inch, Suitable for All Kinds of Measurement Zero Setting with Conveniencet Ports -- LR44 Battery Compartment is Easy to Replace Battery( Note: It Does Not Remember Zero Setting Position After Auto Off), Package included: 1 x Digital Dial Indicator, 1 x Rear Cover, 1 x 1.5V Battery, 1 x Instruction Manual