Reliance Controls THP103 AMWATT Appliance Load Tester / Plug-in Ammeter and Wattmeter. Gives instant accurate reading of wattage and amperage used by household appliances. Reads from 1-1875 watts. 26″ cord. cULus listed. Since 1909, Reliance Controls Corporation has contributed more innovations that 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. The primary product line consists of heavy duty time clocks and controls, generator accessories, transfer switches and transfer panels for portable generators. and inverters. And after over a century of innovation, Reliance Controls Corporation has built an enviable reputation for high quality, superior engineering and exceptional customer service.