The UltraRAE P.I.D. is a hand held PID monitor with a 9.8eV lamp that uses the RAE SEP gas separation tubes for benzene. The instrument has a detection range of .1 ppm to 200 ppm. The RAE SEP tubes are purchased separately and the unit is calibrated with 5 ppm benzene using one of the benzene separation tubes.. The unit can also be used as a general PID to detect organic vapors that respond to a 9.8eV lamp.by simply removing the detection tube from the holder.