The Faithfull voltage detector pen is a convenient tool for detecting the presence of AC current. Simply hold the pen by its body and place the white end cap near or onto a cable or fitting believed to be carrying electricity. The detector tip will light up red if a voltage is present. This tester can be used to detect voltage from 50 to 1000 VAC and is designed for non-contact testing, ensuring complete safety. It features a pen size with a pocket clip, making it easy to carry. The tester includes 2 x 1.5v AAA alkaline batteries. The Faithfull voltage detector pen is suitable for detecting voltage in a range of applications.