A method of calibrating a fiber optic Raman spectroscope system having a primary spectrometer and a plurality of secondary spectrometers (51a-51n), the primary spectrometer comprising a laser source and a fiber optic primary probe associated with the primary spectrometer, each of the secondary spectrometers (51a-51n) comprising a laser source and a plurality of fiber optic secondary probes (53a-53n) associated with the secondary spectrometers (51a-51n), the primary and secondary probes (53a-53n) transmitting light from the laser sources to a target and returning scattered light to the spectroscope to generate a captured Raman spectrum, the method comprising: calibrating each of the secondary spectrometers (51a-51n) in accordance with the primary spectrometer using the primary probe; deriving a transfer function associated to each of the secondary spectrometers (51a-51n) by way of testing the secondary spectrometers (51a-51n) against a fluorescent standard source using the primary probe; recording and storing the transfer function associated to each secondary spectrometer (51a-51n); calibrating each of the secondary probes (53a-53n) against the primary probe to calculate a calibration function associated to each calibrated secondary probe (53a-53n); recording and storing the calculated calibration function of each secondary probe (53a-53n); and correcting the Raman spectrum captured by one of the secondary probes (53a-53n) used with one of the secondary spectrometers by way of modifying the recorded transfer function of the secondary spectrometer used based upon the calibration function of the secondary probe (53a-53n) used, wherein the fluorescence standard source has a known fluorescent spectrum upon excitation by the laser source; and wherein deriving the transfer function comprises: recording a spectrum of the fluorescence standard source through calibration of the secondary spectrometer (51a-51n) using one of the secondary probes (53a-53n) and the fluorescence standard source; and calculating the transfer function of the secondary spectrometer (51a-51n) by bringing the recorded spectrum into line with the known fluorescent spectrum. calibrating each of the secondary spectrometers (51a-51n) in accordance with the primary spectrometer using the primary probe; deriving a transfer function associated to each of the secondary spectrometers (51a-51n) by way of testing the secondary spectrometers (51a-51n) against a fluorescent standard source using the primary probe; recording and storing the transfer function associated to each secondary spectrometer (51a-51n); calibrating each of the secondary probes (53a-53n) against the primary probe to calculate a calibration function associated to each calibrated secondary probe (53a-53n); recording and storing the calculated calibration function of each secondary probe (53a-53n); and correcting the Raman spectrum captured by one of the secondary probes (53a-53n) used with one of the secondary spectrometers by way of modifying the recorded transfer function of the secondary spectrometer used based upon the calibration function of the secondary probe (53a-53n) used, wherein the fluorescence standard source has a known fluorescent spectrum upon excitation by the laser source; and wherein deriving the transfer function comprises: recording a spectrum of the fluorescence standard source through calibration of the secondary spectrometer (51a-51n) using one of the secondary probes (53a-53n) and the fluorescence standard source; and calculating the transfer function of the secondary spectrometer (51a-51n) by bringing the recorded spectrum into line with the known fluorescent spectrum. recording a spectrum of the fluorescence standard source through calibration of the secondary spectrometer (51a-51n) using one of the secondary probes (53a-53n) and the fluorescence standard source; and calculating the transfer function of the secondary spectrometer (51a-51n) by bringing the recorded spectrum into line with the known fluorescent spectrum.