This manual describes the features, operation steps, and specifications of the Sampo JF‑B721VL desktop calculator. It includes sections on device specifications, usage instructions, key functions, and troubleshooting.
The guide explains how to perform basic arithmetic, percentage, profit, and mixed calculations, as well as how to use the dedicated function keys such as CE, % and profit calculation. It also details the power‑on/off procedure and error handling. This manual is written in Chinese.
| Battery | AG-13X1 1.5 V |
|---|---|
| Dimensions | 42 mm × 185 mm × 148 mm |
| Display | 12‑digit LCD |
Press the power button; the display will turn on.
Press the CE button to clear the last entry.
Enter the number, press the % key, then multiply as needed (e.g., 150 × 20% = 30).
It shows the word “ERROR”.