1、Good Reflection: The optical glass ensures high accuracy in the measurement, which will also improve the clearness and reflection of the prism. 2、Wide in Utility: Having been installed on total station, the mini prism can be used for the testing of tunnel, engineering, mine, dam, road an so on. 3、Standard Design: Comes with 25.4mm effective diameter, the total station mini prism also has + 2mm constant for reliable working performance. 4、Great Materials: Consisting of premium optical glass and ABS materials, the survey prism tool is not likely to break, very durable for long use. 5、Easy to Install: Light in weight and compact in size as well, the 45 degree prism accessory is very convenient to install within several minutes.