The Superior AccuTrak® VPE-2000 Ultrasonic Leak Detector is the industry's first digitally controlled leak detector. It functions as two instruments in one, with two independent sensors backed by distinct electrical circuits that are uniquely configured for each sensor. This ensures optimal sound quality and frequency response. When switching between airborne and touch sensors, all settings are stored in memory! Digital LED meters allow you to set baselines, do trends, and repeat these tests more accurately than older, more expensive analog devices.