The AUTOOL AS509 is a professional tester designed to measure coolant boiling points. Equipped with a high-sensitivity sensor, it features fast response and ±3% measurement accuracy, providing accurate test results in just 30 seconds. Built-in manufacturer reference values allow users to compare test results with the reference values and quickly determine whether the coolant has deteriorated. The AS509 offers two testing modes. NORMAL Mode is suitable for most vehicle models and common coolant types, making it ideal for general daily testing and allowing users to directly measure the actual boiling point of the coolant. BRAND Mode includes data for 23 major coolant brands. Simply select the corresponding brand to perform the test and obtain more accurate results. In addition, the AS509 is equipped with reverse polarity protection and overheat protection, providing safer and more reliable operation while reducing the risk of incorrect operation affecting test results.















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