【Aluminum Alloy Digital Dial Indicator】The large 4-digit LCD display is suitable for accurately measuring small linear distances in mechanical and industrial processes. Besides, they can't read error. This product is an ideal tool for mechanics, industrialists and laboratories. 【0~25.4mm Measuring Range】 The measuring range is 0~25.4mm (0~1 inch), high resolution, 0.01mm (0.0005"). 【Includes Back Cover】 Hole diameter: 6.5mm, removable, can be used in different magnetic base holders. 【Inch/Metric Switching】 Can be switched between mm and inch, suitable for all kinds of measurement. 【Zero Setting, with Convenient Ports】 RS232 data output interface and SR44 battery compartment, this allows for easy battery replacement. Product Description The digital indicator can accurately measure small linear distances in mechanical and industrial processes without reading error. The tool can examine the tolerance level when inserting the machine part. It is an ideal tool for mechanical, industrial and laboratory work. Features: 4-digit LCD display Interchangeable between mm and inch Zero-adjustment Material: Aluminum alloy Power supply: 1 x 1.5V SR44 button battery (included) Item size: approx. 122 (L) x 55 (W) x 26 (D) mm (4.80 x 2.17 x 1.02 in) Item weight: approx. 129 g (battery included) Specification: Measuring range: 0 ~ 25.4 mm (0 ~ 1 inch) Resolution: 0.01 mm (0.0005 inch) Response Time: ≤ 0.5 m/s Operating Temperature: 0 ~ 40 °C (32 ~ 104 °F) Storage Temperature: -20 ~ 70 ºC (-4 ~ 158ºF) Relative Humidity: ≤ 80% RH Convenient Ports Port A: RS 332 data output interface, communicate with PC via Port B: SR44 battery compartment, easy to replace them Contact Point Type: M2.5 Thread Attached Back Cover It is removable and can be used on different base support brackets magnetic. Hole Diameter: 6.5mm Package Included: 1 x Digital Dial Indicator 1 x Back Cover 1 x 1.5V Battery 1 x Manual