1,WIDE APPLICATION: Can be installed in tunnels, roads and bridges, dams, buildings and structures or some other fixed places or objects 2,MULTI FUNCTION: Support objects measure, distortion, displacement, suitable for different types of total stations 3,SCOPE OF APPLICATION: Achieve detection of tunnels, subways, mines, etc., suitable for a variety of measuring instruments 4,PERFECT REPLACEMENT: Compatible with for Leica total stations, instead of GMP104, has stable structure and excellent performance 5,ACCURATE MEASUREMENT: Prism glass diameter is 25.4mm, constant for ‑30mm, measuring range within 800meter, accurate and efficient Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.