I could not get pump below 750 microns, also needs a 3/8" flare fitting. It's low power, so it has to be set pretty high to get a good vacuum but it works great. It gets hot if you aren't careful to take breaks, so make sure to give it a few minutes to cool down between runs. Not a heavy production unit, but great as a cheap bench top unit for hobbies, which is exactly what I bought it for.