Consumer energy efficiency measurement service, namely, the service of measuring a retail or commercial gas consumer's real energy efficiency over time wherein the effects of changes caused by weather and gas prices are eliminated

sensors for sensing the presence of a gas in a liquid; gas and liquid sensors and monitors; oil level sensors for compressors and other oil operated or lubricated machines and apparatuses; refrigeration monitoring systems including for monitoring loss of refrigerant

GAGE WHICH IS USED TO CHECK THE SUPPLY AND/OR LEAKING OF PROPANE GAS