Setup, Compatibility & Care
Setting up the EL-331ERB is straightforward; the device is ready to use immediately out of the box. Because it uses a hybrid power system, ensure the solar panel is exposed to ambient light during initial use to preserve the internal battery life. To keep your calculator in top condition, always snap the protective cover back onto the unit when you are finished with your tasks. Clean the screen and keypad periodically using a soft, dry lint-free cloth. Do not use liquid cleaners or solvents, as these may damage the plastic casing or the display interface. If the display begins to fade despite good lighting, it may be time to check or replace the backup battery.