Tian et al. [45] reported that the best wavelength range for quality determination of watermelonis in the region of 300–1000 nm. The wavelength in the range of 400–1700 nm to measure the qualities of intact and sliced melons and watermelon by reflectance mode was reported by Flores et al. [46]. The results showed that the development of model was poor for predictive ability of whole fruit such as cantaloupe melon with standard error of cross validation (SECV) = 1.43 Brix and R2 = 0.12; while Galia melon SECV was 0.92 Brix and R2 = 0.67, respectively.