I had to charge my AC at 134a. I didn't know if I had lost everything because of a leak or something, so I wanted to do it right and not just squirt at random anymore. I'm not a professional mechanic, I just love fixing my cars. I wanted something that was well made and had a solid reputation for durability but wasn't rated as a pro. Great after 2 uses. This allows you to control both the high and low pressure to ensure you are getting the right amount (correct working pressure) back into your system. Considering the build quality and the quality of the gauges I'm sure this was the right choice and will last longer than cheaper units.
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