The Finnigan/Tremetrics Model 9001 GC is no longer in manufacture. Your 9001 may include a configuration of any three of the eleven high performance µGold detectors such as the63 Ni ECD, TCD, FID, PID, NPD, HALL® ELCD, FPD, DID, Tandem PID/FID, PID/NPD and PID/HALL. Contact a Thermo Scientific customer service representatives for availability of options, detectors and parts.