Desktop calculator Donau TECH K-DT4120-01 — 12-digit display, dimensions 185×140×37 mm, black

Donau TECH K-DT4120-01 is a desktop office calculator with a 12-digit display and a compact housing measuring 185×140×37 mm. It is designed for everyday calculations in offices, shops and accounting tasks, providing clear numeric visibility on a large single-line screen. The device combines standard arithmetic functions with a stable, low-profile design intended for desktop placement and frequent use.

Advantages

The calculator offers a 12-digit display that makes it suitable for financial and accounting figures, reducing the need for mental rounding. Its compact dimensions and flat profile save desk space while maintaining key placement ergonomics for efficient data entry. The black finish provides a neutral, professional appearance that integrates easily into office environments. The overall construction focuses on straightforward operation and reliable basic functionality.

Suitable for

• Everyday office arithmetic and bookkeeping
• Point-of-sale and retail cash calculations
• Basic accounting entries and invoice checks
• Home budgeting and financial planning

Key specifications

• Display: 12-digit numeric LCD
• Dimensions: 185 × 140 × 37 mm (length × width × height)
• Color: black housing
• Form factor: desktop / low-profile
• Function set: standard arithmetic operations and basic memory functions

How to use

Place the calculator on a flat desktop surface within easy reach of your work area. Use the numeric keypad and function keys to enter values and perform arithmetic operations. For sequential calculations, employ the memory keys to store and recall intermediate results. The single-line 12-digit display shows the current entry or result; verify entries visually before confirming totals. Follow standard calculator input conventions: clear the display before beginning a new calculation and use the decimal key where required.

Usage recommendations

For reliable operation, keep the calculator on a clean, dry surface and avoid exposure to direct sunlight or excessive heat. Replace batteries according to the manufacturer’s guidance and clean the housing with a soft, dry cloth. For frequent accounting tasks, pair the calculator with a nearby notepad or spreadsheet to record results and maintain a clear audit trail.