TuffCalc? features an extra large 12 digit angled LCD display. Water and shock resistant design is great for restaurants, schools, construction, healthcare and hotels. Washable with soap and water. Calculator includes an acrylic protected display, sealed rubber keypad and rubber gasket surround for extreme durability. Perfect for working conditions where weather, dirt or germs are a factor. Other functions include: automatic tax keys, grand total, percent key, square root key, 3 key independent memory, automatic constants and hybrid power (solar/battery backup). 2 year manufacturer's standard warranty.