To solve the failure problem of the visible/near infrared (VIS/NIR) spectroscopy model. soluble solids content (SSC) detection for fresh jujubes cultivated in different modes was carried out based on the method of variable optimization and model update. Iteratively retained informative variables (IRIV) and successive projections algorithm (SPA) algorithms were used to extract characte... https://www.petsafewirelessfence.com/product-category/headwear/