1. Writing Board Design The scientific calculator features a 6inch writing board and a hidden pen, allowing you to take notes while calculating. Press the erase button to clear your notes, and the bottom of the calculator includes a lock switch to protect your handwritten content from accidental touches and enable efficient storage. 2. Lightweight Portable This mini calculator has an erasable writing pad and a foldable design, weighing approximately 200 grams. Its compact size makes it easy to carry in a bag, and it can be quickly retrieved for immediate use when needed. 3. 240 Calculation Functions This engineering calculator offers 240 calculation functions, covering a wide range of operations such as statistical calculations, scientific functions, and more. These include standard deviation, sum of squares, functions, square roots, and scientific/engineering notation. 4. Definition TwoLine Display Equipped with a large twoline LCD display that emits no blue light, this scientific calculator features a 102digit display for clear and precise number and result presentation, ensuring efficient and error work.