Electrical tester have all the advantages of traditional solenoid tester, with none of the typical drawbacks. Use all 3 voltage detection methods � light, sound, and vibration, to work more efficiently in noisy environments, dimly lit areas, or tight spaces. This full-featured electrical tester includes voltage and continuity measurement, a Rotary Field Indicator, resistance, and a digital display with 0.1 V resolution. For most residential, commercial, and industrial applications.