All Franklin Sensors products are Made in the USA. We believe that high-quality products make high-quality projects, and we strive for excellence from beginning to end of our production process. ACCURATE: More sensors = More accuracy. Conventional stud finders have 1 or 2 sensors. The ProSensor M90 has 9, making it the most accurate stud sensing tool on the market. The ProSensor M90 has a max detection depth of 1.5". The LEDs track the location of studs while displaying the center and edges simultaneously. EASY: One mode finds it all! The ProSensor M90 adjusts for a variety of depths, materials and textures. No calibration required. Press and hold the button to begin scanning. Unlike other stud sensors that give false readings, the ProSensor M90 allows you to start scanning anywhere, even over a stud. DISPLAYS FULL STUDS: The ProSensor M90 displays the center and edges of studs simultaneously, showing single studs, double studs, and irregular configurations that other stud finders cannot detect. Works through drywall/sheetrock and more! DURABLE: #1 Rated by consumers and professionals, the ProSensor M90 stud finder is both accurate and durable. MORE INFO: Uses common AAA batteries. Is NOT compatible with rechargeable batteries.