This is a CASIO diving watch manual, which can set time, date, alarm, temperature, etc., and also has diving mode and search mode.
The Casio 2172 is a dive watch that offers timing, depth, temperature, and alarm functions. The manual explains how to set the time, switch between timer, depth‑meter, and temperature modes, and use features such as automatic illumination and alarm settings.
Safety, battery maintenance, and sensor calibration are covered in detail. It describes proper use limits, battery‑low warnings, how to replace the battery, and procedures for calibrating the temperature sensor and resetting depth values. This manual is written in Chinese.
The BATT indicator appears when the battery is low; certain functions such as depth and temperature measurement become unavailable.