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For the DIY or Shop that works on hybrids with electric A/C compressors a MICRON gauge is a must. If you do not want or can not afford a new up to date RRR Recovery, Recycle,Recharge machine, then add a MICRON gauge to your existing machine or gauges. Just make up some adapters and attach. This is only one of a few different ones that I have, always trying to find the best tool for the job and you should always have back. When you have 6 or more micron gauges, to test them if you have any doubt if one if inaccurate. Just attach all of them to the same manifold and vacuum pump and they all should read the same. At $150 it not too high, its not the best but it works. But for sure it beats the cheap inaccurate gauges sold on tool trucks and in stores. This is the part of the vacuum reading you can not read on any refrigerant manifold gauges that have the old style gauges with the needle. Vacuum "IS NOT" a good way to look for leaks in a A/C system. Extreme high vacuum is a vary good way to tell if you have MOISTURE saturated a/c system. Especially if a DIY or repair shop just spent a lot of time and money replacing parts, flushing out the A/C system and then the TECH or DIY goes and buys a CHEAP bottle of ester oil in a plastic bottle that has been sitting on a shelf for months or even years " totally saturated with moisture" and installs it into the A/C system and just waist your time and shorten the life of the new electric compressor!. Here is a TEST. buy the cheap ester oil in the plastic bottle and but a metal can of Toyota ND-11. Put both in their own glass test jar and apply vacuum to each one. You will see the ND-11 just sit there. Now do the same with the the cheap plastic bottle of ester oil and you will see it start to form bubbles and as you approach deep vacuum some times boil out the moisture and if it has a lot of moisture heat it up with a hair drier to about 100F and tap the side or bottom of the jar and it will foam up like a coke as if you shake it and remove the cap. This is the water trapped in the oil coming out. Another test you can do is pore a few OZ. of new clean dry ester oil out of a metal can into a dish sitting on your table. Now let it sit there for 2 or three hours. Pore it into your test jar, pull a deep vacuum and you will see it start to boil like water on your stove top. That if how sensitive ESTER oil is to being exposed to the air and how fast it pulls water out of the air into itself. This is why no real A/C TECH ever works with out a micron gauge on a electric compressor system with ester oil in the system. (Food for thought) any one can train a monkey to attach a red and blue hose, suck , blow and go to make a buck. It will work but the customer will pay in the end.