"Highly sensitive & advanced low noise circuitry provides clear and more accurate results" Rated #1 for residential/commercial slab leaks Solid aluminum construction housing contains circuitry, controls and meter: Weight 2.5lbs. Dimensions: 3" x 6" x 10" "Easy to read sensitive meter that displays microphone response and indicates battery status" "Ultra-sensitive microphone to detect a wide range of water leak sounds." "Wide-range controls to adjust amplifier gain, meter sensitivity and filter frequency " Filter Range 20Hz - 50Hz on 'Lo', 20Hz - 3.5Hz on 'Hi Padded stereo headphones to reproduce leak sounds and effectively shut out external noise Perfect for residential and commercial slab leaks "Perferred by experienced underground leak locating professionals for decades"