Buy these from on Ebay UK here
Oil testers id recommend doing this test on every car to ensure the oil is present and not contaminated, you do not want to over or underfill the A/C system with oil as both are bad and so is contaminated oil so check regularly.
To use these you ned to follow exact instructions below.
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, 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.
The oil checker is a 1 time use item.
THE COMPRESSOR CLUTCH MUST BE ENGAGED OR RUNNING TO GET A CORRECT READING.
See the whole process in video below
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