TPI laser plumb tribrach is great for accurate plumbing of total stations, GPS systems, reflector systems & other accessories. This tribrach has a bright 650 nm focused laser dot that provides prompt and precise positioning over a point. TPI laser tribrach features a  8-min vial, leveling screws with center line and a 5/8 x 11 base. Will work with most survey instruments and accessories manufactures such as: Topcon, Sokkia, Trimble, Nikon, Leica, Pentax, Seco, CST, Omni, Etc.