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They don't work. Trust me on this. Pick up your bottle and shake it. If you hear a sloosh you've got gas.

However, you'll still run out at difficult moments. Human nature and gas prices being what they are means that getting a not quite empty bottle refilled before the trip is unlikely to happen. So the most economical way to use your gas up is to have two bottles. Also it saves that sinking feeling when it's Sunday night, the gas runs out in the middle of cooking dinner, the warden has just gone home and anyway, he just sold the last refill in the size you need...... 

these work,

Those magnetic level indicators are rubbish, in fact i have just chucked mine out.

I think the best way to tell is to weigh the bottle on bathroom scales.

If you bottle is like my calor butane 4.5kg one it has a metal disc below the valve that has numbers on it. My says 13 2 which means it weighs 13 pounds 2 ounces empty. When full it should be around double this weight, so just weigh it before you go camping and then you'll know roughly how much gas is left

The only accurate method is to weigh the bottle, I use a spring balance.

The pressure gauge type are inaccurate, as the liquified gas vapourises at a pressure dependant upon the ambient temperature which is not constant.