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Many aspects of the solar atmosphere remain poorly understood, including the mechanisms at work to heat the plasma to a million degrees. Spectroscopy is key to probing this extreme environment. After a brief introduction to the scientific questions, and the observational difficulties, I will present details of a high-resolution spectrometer designed and built at Aberystwyth with international collaborators. The spectrometer has been tested during the total solar eclipse of 2019 in Argentina, from which I will present preliminary results. Future developments, including the potential for additional channels, a hyperspectral imager, and the hope for a space-based instrument, will be discussed.
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