... 1-remote control failure self-testing software 2-laser distance test and plumpt 3-custmizable road s PJK PTS-120R ... station, theodolite, level,RTK GPS, GIS, handheld GPS, Rebound tester, laser vertical collimator, laser rangefinder, laser swinger, laser line marking, laser telescope rangefinder,etc. ... like land survey and underground pipeline leak test as well as underground pipeline survey, etc.