The FHR640 and FHR1000 are automated Czerny-Turner spectrometers, featuring a 0.64 m focal length (FHR640) and a 1 m focal length (FHR1000). Especially designed for researchers who require high accuracy with immediate results, the versatility of the FHR series allows for utilization over a wide spectral range, extending from the UV range (140 nm) to the IR (depending on the grating and detector used). The FHR has been designed to minimize any stray light reaching the focal plane. The optical cavity includes blackened baffles and masks to trap unwanted light. In addition, the optical design of the FHR is free from re-diffracted light (re-diffracted light is a source of stray light that involves multiple reflections off the optical components themselves and is therefore very difficult to mask).