CC wrote:
> The easiest way to check the fuel level in propane tanks
> is to boil water in a pan or kettle then pour the hot water
> down the side of the tank. When you slide your hand down
> the tank where you poured the water, the temperature will go from hot to
> cold,
> Where it has turned cold is the level of gas in the tank. In the winter,
> the gas coming from the tank will cause a frost
> line around the side of the tank. This will also indicate fuel level.
> CC

I have seen liquid crystal stickers (that change color with
temperature)sold for that purpose. Also you could check it with a
non-contact thermometer which are now really inexpensive and handy to
have around for lots of similar purposes.