The Casio DM‑1600F is a high‑precision 16‑digit desktop calculator designed for professional and business office environments. It features two‑way power (solar + battery), ensuring reliable operation even in low-light conditions. The calculator has an extra‑large LCD display, making it easy to read long numbers and preventing input errors. With a metal faceplate, the DM‑1600F has a durable and premium feel suitable for frequent use. It offers tax calculation, regular percent, and a rounding selector (F, CUT, UP, 5/4) to handle various financial and accounting needs. There’s also a decimal selector (4/3/2/1/0/ADD₂) for flexible formatting. The device supports independent memory (two memories) for storing intermediate values. It uses a sign change (+/–) function and has 3-digit comma markers to improve readability. Each key has a shock-absorbing structure that makes typing comfortable even with heavy use. The body is ergonomically shaped (round and slightly bulged at the back) to rest comfortably in the hand during prolonged calculations. Finally, it comes with an auto power-off function to save energy, and its reset button clears memory, rate settings, and more when needed.