Originally Posted by Dave_Monica
You can check by pouring hot water down the side of the tank. The empty space in the tank will allow the tank to warm...the propane in the tank will keep the tank surface cool. You can easily tell where the propane level is.
I kind of do a combination of methods. I do get my empty filled after switching over to the full, but it may be later on in life before I get around to it. I always weigh, my second tank, when pulling the empty to make sure how much propane it has......then may end up getting both filled at the same time depending on this.
Dave, You got me to wondering though if a thermal gun would do the same thing. I could use it to check the temps on the bottle. I do carry one of those and check wheels/bearings/tires when stopped on trips.
I may go home around lunch and try it all out.