When working with electrical equipment, it’s important to keep a handy voltage detector with you. The circuit of a non-contact voltage detector detects electric fields that can be used without touching the electrical supply. If there is an electrical current, it can beep or flash near the power source with ease. A voltage detector has a built-in sensor at the tip of the tester which can be easily pointed towards the source of potential voltage. The best part is that this small instrument is portable and can easily fit into your pocket for easy access at all times.