MASTER-20α are low concentration model (measurement range Brix 0.0 to 20.0%) of the MASTER-α / MASTER-Pα. Good for measurements of low concentration fruit juices, cutting oil, etc. It is Automatic Temperature Compensation (ATC) model with water resistant feature (IP65). The MASTER-20α is made of metal, and the MASTER-20Pα is plastic. The specifications are exactly the same. For salty and acidic samples, choose the plastic body, MASTER-20Pα.