AUTOOL 9PCS refrigerant oil checker analyzer tester for AC systems compatible with R134a/R1234yf refrigerants Review

Application→ This product is only compatible for R134a / R1234yf system. Practical Function→ This is a cost-effective and simple method to detect the oil level of air conditioner and harmful acids in the oil of air conditioner system without changing the air conditioner system and draining all the oil in the system. Why Do You Need Oil Checker?→ Many A/C compressor failures are caused by low oil levels and dirty contaminated oil in the A/C system. The use of this low cost oil checker can save you the cost of a new compressor plus the down time caused by the replacement of a compressor. Easy to Operate→ It is very easy to use. Operate the A/C system for 15-20 minutes. Put the oil checker between your thumb, index finger and middle finger and with the A/C compressor running, the push down on the low pressure (suction line - which is normally the big A/C line) 2 or 3 times. Set oil checker upright for 3-5 minutes then pick up the oil checker and check the oil level.(If the tube is 1/2 full or more, DO NOT add oil to the system. If it is below 1/2 full, add oil to your system.). Satisfied After-sales→ No worry to return in 30 days. Our professional technical team will help you within 24 hours if you have any problem when you use it.(Kindly Reminder: the compressor clutch must be engaged or running to obtain the correct reading.).