Colour information in light holds the key to understanding materials and processes in the world around us. We build fundamentally powerful optical instruments that help unlock this information. Researchers across many scientific disciplines utilise spectroscopic techniques to interrogate light and reveal its colour composition. However, the colour range is often narrowed significantly when higher resolution is required. We have designed and built a compact, robust and affordable spectrometer for imaging the entire visible spectrum in a single snapshot and with ultra-high resolution. Our device provides researchers with the ability to carry out precision experiments, in any environment.