Stanley Intellisensor Pro Stud Sensor 77-255 with Stanley Leverlock 30 Foot 30-830 Intellisensor Pro: Finds edges of studs/joists. Two sounds for locating studs/wires. Large LCD screen, Continous wire detection. 1/8" Wood Stud accuracy, 1/4" Metal Stud accuracy. Automatic Shut-off to conserve battery life. Leverlock Features: 30" Blade Length. Rubberized Blade locking level. Comfortable non-slip grip. Compact dual-material case made with high-impact ABS material. Blade guard. Blade release button.