Item Type: Total Station Prism Material: Copper, glass Prism Glass Diameter: Approx. 25.4mm / 1in Constant: -30mm Measuring Range: Within approx. 800meter / 2624.7ft 1WIDE APPLICATION: Can be installed in tunnels, roads and bridges, dams, buildings and structures or some other fixed places or objects 2MULTI FUNCTION: Support objects measure, distortion, displacement, suitable for different types of total stations 3SCOPE OF APPLICATION: Achieve detection of tunnels, subways, mines, etc., suitable for a variety of measuring instruments 4PERFECT REPLACEMENT: Compatible with for Leica total stations, instead of GMP104, has stable structure and excellent performance 5ACCURATE MEASUREMENT: Prism glass diameter is 25.4mm, constant for ?30mm, measuring range within 800meter, accurate and efficient1 x Total Station Prism