........but I've taken a couple of Rennies so I should be ok in a while! Seriously, a quick question and I'm not sure if this is the right section (if not, feel free to move me) - Is there a gauge I can buy to tell me how much gas I have left in my standard butane and propane bottles? The (un)helpful guy in the local shop told me that you know when it's gone when the gas runs out (!).... which isn't very useful if I'm in the middle of nowhere. I've seen that some cylinders have a mini-gauge on them but am I right in saying that not all have them (most here in Ireland don't). I have also seen that some people weigh theirs and use that to work out what's left but am trying to avoid scales, unhooking, different bottles etc. Am I missing something? Any help would be appreciated.