I know there are many difficult manifold gauges out there. I needed a simple, inexpensive boost gauge to test my 410a air conditioners. For that it works great. Gauges are easy to read. I've never tested it, but it comes with R-134a and R-22 refrigerant caps. I will update my review after using it on either of these systems. You can also order 410a refrigerant from Revain if you run out of refrigerant.
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