Terry, a spring balance is the best way to check contents in a gas cylinder.
The unfilled weight (tare Weight) is stamped on a plate on the cylinder.
The difference between the tare weight, and the weight shown on your spring balance is the weight of propane in the cylinder.
Gauges are notoriously innacurate.
Besides, if you fill from a tank that's been standing in the sun all day, you get less weight for the same volume.
TIPs,
1) Fill up in the morning to get more gas for your loot.
2) When your cylinder is empty" but still gas a bit of pressure,
Take it to a well ventilated place without drains,
turn it upside down and
then open the valve.
You'll be surprized how often water comes out.
The unfilled weight (tare Weight) is stamped on a plate on the cylinder.
The difference between the tare weight, and the weight shown on your spring balance is the weight of propane in the cylinder.
Gauges are notoriously innacurate.
Besides, if you fill from a tank that's been standing in the sun all day, you get less weight for the same volume.
TIPs,
1) Fill up in the morning to get more gas for your loot.
2) When your cylinder is empty" but still gas a bit of pressure,
Take it to a well ventilated place without drains,
turn it upside down and
then open the valve.
You'll be surprized how often water comes out.