MASTER-53PT are capable of measuring various kinds of juice, coffee, processed food such as sauce, ketchup etc. This has an Automatic Temperature Compensation (ATC) function and is a good alternative choice when the water resistant feature is not a priority. The MASTER-53T is made of metal, and the MASTER-53PT is plastic. The specifications are exactly the same. For salty and acidic samples, choose the plastic body, MASTER-53PT.