So how do you tell how much gas you've got left?

[MaryMotherOfCheeses]

And why have they not invented some kind of device which tells you?

How much does a canister cost? Iirc it was £15 to hire the thing and £15 to fill up with gas.

Thanks MrsB.

I need to have a good look at what I've got but that looks helpful.

Sorry for delay in responding, have been at work. Roll on weekend, eh

Our motor home came with 2 large calor gas tanks. We swapped one for a refillable safefill tank and its fab. You get a clear strip along the length do can see how much is left, and when running low take it to the nearest garage that has LPG and refill it yourself for a fraction if the cost. I hope they will make smaller bottles soon for tent campers.

You can buy a pen that tells you how full the bottle is. DH has one at school which he uses in lessons, but I don't know what for. It uses ultrasound I think.

I can't add a link at the moment, but it's called a Dometic Gas Checker.

a pen? ultrasound? witchcraft?
tell me more. please!!

It just sends an ultrasound signal through the bottle and you move up (or down) the bottle to find the level that the gas is at. I've asked DH and he says no magic is involved.

Gas checker pen