[Mike] lives in a temperate rainforest in Alaska (we figured from his website’s name) and uses a 570 gallon oil tank ... different sensors he had considered to measure the oil level and finally ...

Tank level indicator, Tank level sensor, Float level switch, Fluid level sensor, Level controller, Level gauge, Level indicator, Level probe, Level sensor, Level system, Level transmitter, Liquid ...

[Renzo Mischianti]’s friend has to keep a water tank topped up ... with a solar-powered sensor that communicates over LoRa, and a controller that receives the water level readings and powers ...