The Klein Tools ET45VP AC/DC Voltage and Receptacle Electrical Test Kit includes an Electronic Voltage Tester (Model ET45) and a Receptacle Tester (Model RT210). The ET45 is designed as a simple, easy to use tester to check, verify or troubleshoot common residential electrical wiring in electrical outlets, light fixtures, doorbells and more. This tester does not require batteries, and features a pocket clip for convenient carrying. The RT210 is designed to detect the most common wiring problems in standard and GFCI receptacles. A convenient chart on the tester helps determine wiring condition in outlet, based on LED lights results. Conditions indicated: open ground, reverse polarity, open hot, open neutral, hot/ground reversed.