I have two vertical 20# propane tanks. Is there a device that will tell me when the tanks need re-filling? I really don't want to empty them just to know that they need to be re-filled.
My trailer is set up for only a single propane tank so it is really important to know the propane level. I use a translucent fiberglass tank from Viking Cylinders. It is not so easy to discern the propane level in bright daylight, but when the ambient light level darkens, shining a flashlight into the propane from the rear of the tank makes the level quite visible: