Non-destructive internal quality assessment of “Hayward” kiwifruit by waveguide spectroscopy

► The research aims to non-destructively assess the kiwifruit quality by waveguide spectroscopy. ► The 2-20 GHz frequency range was explored. ► The assessment of the SSC and MTf were conducted with PLS regression analysis. ► SSC and MTf were predicted with R2 values up to 0.804 and 0.806, respectively.