Can be widely used for beverages, fruit juices, soups, beef bowl sauce, water-soluble cutting oil, etc. MASTER-M is made of metal, and MASTER-PM is plastic. For salty and acidic samples, choose the plastic body, MASTER-PM. This product is the cheapest type with no temperature compensation function. Since the concentration changes as the measurement temperature changes, MASTER-α and MASTER-T are recommended if you have trouble managing the temperature at each measurement.