[Material]:This mini with poles is made of metal,ensuring durability and long term performance [ClearAndAccurate]:Enhance the reflection ability of ,possess full texture,clear and bright,improve the accuracy of measurement,measurement work become more simple [Constant Value]:The comes with a constant value of +17.5MM/0MM/-30MM,offering precised measurements for your surveying needs [Mini Head]:Mini for total station features a mini head that enhances the accuracy of measurements and ensures reliable results every time [Versatile Use]:Mini can be used for tunnel,,mine,highway detection,etc.,suitable for measuring ,widely used in railway,,steep slopes and other industries, Weight: 1.48371102326 pounds, Manufacturer: TWISAXC