You can build your own, https://makezine.com/projects/build-hack-and-deploy-detectors-to-measure-solar-uv-radiation/ https://makezine.com/projects/build-hack-an

You can build your own, https://makezine.com/projects/build-hack-and-deploy-detectors-to-measure-solar-uv-radiation/ https://makezine.com/projects/build-hack-and-deploy-detector... Or buy one https://www.solarmeter.com/model65.html https://www.solarmeter.com/model65.html