UNI-T UT15B is a multifunction voltage tester capable of measuring AC/DC voltage up to 690V. It features visual and acoustic continuity indication, single-pole phase indication, and 2-pole phase rotation indication. The LCD display provides clear readings, and the LED indicators offer quick visual feedback. The tester is compact and lightweight, making it easy to carry and use. It is suitable for electricians, technicians, and DIY enthusiasts for various electrical testing applications.