Traditional spectrometers use a slit to allow light to pass into the instrument and focus on the target substance. Our spectrometers are different: we use optical fibres of 1 mm – 3 mm, although a 5 mm is possible. Using a fibre rather than a slit aids transmission; where light is usually lost, it is retained and, therefore, can be focused on the target. More light on the target delivers a stronger signal, particularly helpful when measuring substances with weak Raman signals. ISI’s standard HES spectrometer offers a 100-fold increase in throughput over current conventional systems. This increased throughput can lead to a superior signal-to-noise ratio (SNR) for a given observation over a Czerny Turner instrument. The HES spectrometer contains no moving parts and yet offers the advantages of a Michelson Interferometer with the spectral properties of a traditional diffraction grating-based device, such as a Czerny Turner spectrometer.