Helium tank (PARTIAL) 🥕

We purchased a helium tank for a birthday party and ended up not using all of it. This is my first helium tank so I don't know how to tell how much is still left, but if I were to guess I'd say less than half? Don't count on it to fill many balloons, but surely there must be enough gas left to make a kiddo happy 🙂 PS: Cat not included!