Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Has anyone tested the strength of the vacuum, i.e. what the air pressure inside it actually is? I'm curious to know and also a little skeptical.
Document: The container itself has a slight tint to it, but I assume it's not sufficient enough to prevent any sort of degradation to beans due to light, so we keep it in a cupboard away from the stove/refrigerator to minimize destroying our beans. I'm happy with it, and would highly suggest it to anyone who doesn't mind spending a few dollars to help extend the life of their coffee beans.Also, you can use the container for a fun trick to do to demonstrate how atmospheric pressure works.
I ordered this canister being a little skeptical because of a couple of bad reviews. I received it 1 day earlier than promised and put it to the test right away. I was truly suprised at how easy it was to use the pump (even without an owners manual), and how tight of a seal it creates. This is great coffee storge for my intended use. I'm very serious about my coffee, I roast my own beans because I want the freshest cup of coffee possible.
Takes about 10-12 pulls to extract the air. However, I never have heard the clicks other users have talked about. The other thing I really didn't like was the format of the directions -- mostly pictures, very little words. Since I know how to read, I like my directions to be spelled out--not pictures that need to be interpreted. I would have like to know from the manufacturer that brown sugar or other finely ground products can or cannot be stored in the container.
I simply love this container for storing my coffee beans. The hand pump that came with is is easy to use and high quality plastic.The container itself is darkened enough to keep out harmful sunlight, but still easily allows you to see what is inside.The lid of the container is tight fitting and has never failed me. I happen to keep mine in the refrigerator and I've never lost any vacuum pressure.
Holds about a lb of ground coffee. Easy to close. Holds the seal well. I use a damp dishtowel & wipe off the seal every few days. It is actually hard to open sometimes. You really have to press down & in on the little seal nubbin to release the vacuum. But I prefer that to it leaking!
Also, I was a little confused how to release the vacuum to open the container the first time I used it. To me the instructions looked like you press down on the small rubber nub in the middle of the lid. In reality you need to push the nub sideways to release the vacuum. I absolutely love popping the lid off this thing and getting a blast of fresh coffee smell in my face everytime, this container works great!
I was a little bit skeptical before buying this product, since I saw some reviews that it can not hold vacuum for long periods of time.This is totally untrue, I have left my coffee for a month in there now, without checking it, and yesterday when I came to check it, it was still well under vacuum, and the coffee was fresh as the first day I opened it!! !Great product, came in perfect condition, exactly as replied by the seller!
Opening is also easy. Just remember to bend the nipple to the side to release the vacuum (like you were emptying a beach ball).I like the transparent base. It is easy to see how how full it is.The container does have some rubber (elastic?) parts that may wear over time but no problems so far (I have only had mine for 2 months).I would consider getting more of these for other dry staples (e.g.
Now, theres no moving parts here, there actually isn't many parts to this thing to begin with. I bought this item, not only because of what it was supposed to do but also because it is made in Europe and not China! Well, so much for that! maybe it's a chinese factory over there cause this product sucks. Inferior quality. you will be better off storing freshly ground coffee in the paper bags it comes in, that's what i do now.
This well constructed polycarbonate container maintains a strong vacuum. Coffee's greatest enemies are heat, light and air. The container protects from light. The vacuum mechanism, while simple to use, maintains an airless environment for coffee storage. Also these containers can be used for other food storage. Really, a well made product.
Answer: I put an barometer inside the Vacu Vin and pumped out the air.  The barometer reached its minimum range (couldn't go any farther) at about 228 mm of mercury, which is 30% of sea level pressure, equal to the air pressure on top of Mt. Everest.  The pressure in the Vacu Vin goes lower than that but I don't know by how much since my barometer wouldn't read that low.