AUTOOL LM150 ball valve type intelligent electronic refrigerant meter, high and low pressure valve with V-shaped opening design, can accurately control the valve open or closed, with good flow regulation function, easy operation, accurate testing and longer service life. The meter features pressure testing, temperature testing, refrigerant charging, evacuation, holding pressure leak testing and a built-in database of 93 refrigerant NIST standards, it is the best helper for the repair and maintenance of air conditioners, refrigeration equipment and heat pumps.