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.
Gauges are pressure sensitive, not volume, so it will read a high pressure until the tank is almost empty. I have an auto-changeover regulator, but I only open one tank at a time. Since we camp only where there are hookups, we only use propane for minimal cooking inside and the outdoor grill and stove. I don't want it to switch without me knowing it and suddenly have two empty tanks. JMO.