The Intellitouch PT10 Mini tuner pushes the envolope further for compact-sized tuners, while still having a large, easy-to-read backlit display. Clips-on and tunes electric and acoustic guitars, basses, violins, banjos, mandolins and more without interference from ambient room noise. Small, compact size,One-handed swivel clamp, Tunes in noisy environments, Large, easy-to-read needle on LCD screen , Color-changing backlight (red means out of tune and green means in tune), Calibration from 430Hz to 450Hz, Dimensions: 3.4"H x 2"W x 1"D (without clip) Weight: 2 oz. (PT-10)