The Klein Tools ET60 Electronic AC/DC Voltage Tester is powered by the applied voltage in the circuit being tested, eliminating the need for batteries. Integrated test-lead holders are designed for storage of test leads or for holding the probes correctly spaced for insertion into tamper-resistant US-style outlets. This model tests AC/DC voltage from 12-600V at nine useful levels aligned with commonly used voltages. The LED display lights reports the voltage present in the circuit being tested.