From the manufacturer: About Reliance Controls Corporation:: Since 1909, Reliance Controls Corporation has contributed more innovations than any other single manufacturer and has been awarded over 85 patents on manual transfer switches, time switches and accessories. Reliance Controls Corporation specializes in the manufacturing of a wide variety of electrical products. And after over a century of innovation, Reliance Controls Corporation has built an enviable reputation for high quality and superior engineering. Reliance Controls THP103 AmWatt Appliance Load Tester/Plug, Blue: Ammeter and Wattmeter: Reliance Controls THP103 AmWatt Appliance Load Tester gives instant accurate readings of wattage and amperage used by household appliances and eliminates the need for expensive clamp-on meters and line splitters. Check the quality of outlets before plugging in your refrigerator and other appliances to ensure there're no immediate risks and hazards. Reads from 1-1875 watts. 26" cord. cULus listed. Gives instant, accurate digital readout 26" cord to reach remote electrical outlets Easily switches between reading amps and watts cUL Listed Keep your house safe and Rea-dy for a power outage: Installing a power generator will make sure your house stays functioning in the event of a power outage. Installing a transfer switch will make the process as easy as, well, flipping a switch. Prepare for when severe weather hits: Storms and severe weather can be all the more frightening if you don't have anything to back up your house in the event that power lines go down. Having that backup generator means one less thing to worry about. Call your local and trusted electrician for installation: For those that are not experienced working with electrical wires, it is highly recommended to call your local electrician. The installation process can be dangerous, utilize a professional to do it safely and correctly. You can rely on Reliance Controls!: Reliance Controls is here to ensure every residential and commercial building is equipped to any electrical issue that could occur, whether it's dangerous weather or damaged power lines. Meter gives instant, accurate digital readout Readout measures amps or watts used by common-cord connected household appliances (1.0 to 15.0 amps, 125 to 1,875 watts) Long 26-inch cord reaches remote electrical outlets Rugged, high-impact construction Rugged, high-impact construction