1. Overview
This manual provides detailed instructions for the proper use and care of your Casio AMW320R-1EV Marine Ana-Digi Dive Watch. Please read this manual thoroughly to ensure optimal performance and longevity of your timepiece. This watch combines traditional analog timekeeping with digital functions, designed for durability and water resistance.

Figure 1: Casio AMW320R-1EV Watch Face. This image displays the watch's analog hands, digital display, and the markings on its rotating bezel.
2. Key Features
- Quartz Movement: Ensures accurate timekeeping.
- Protective Mineral Crystal: Designed to resist scratches and protect the watch face.
- Case Diameter: 45 mm, providing a clear and legible display.
- Stainless-Steel Case: Offers durability and a robust design.
- Black Dial: Features a clear, contrasting display for easy readability.
- Day-Date-and-Month Functions: Digital display provides comprehensive calendar information.
- Water Resistance: Rated to 330 feet (100 meters), suitable for snorkeling and swimming, but not for scuba diving.
3. Initial Setup
3.1. Setting the Analog Time
- Pull the crown (located on the right side of the watch case) out to the first click position.
- Rotate the crown to adjust the analog hour and minute hands to the desired time.
- Push the crown back in to the normal position to start timekeeping.
3.2. Setting the Digital Time and Date
The digital display offers various modes for time, date, alarm, and stopwatch functions. Refer to the specific button functions for detailed adjustments.
- Press the MODE button (typically bottom left) to cycle through different digital modes (Timekeeping, Alarm, Stopwatch, Dual Time).
- In Timekeeping mode, press and hold the ADJUST button (typically top left) until the seconds begin to flash, indicating setting mode.
- Use the FORWARD and REVERSE buttons (typically top right and bottom right) to change the flashing value.
- Press the MODE button to move to the next setting (e.g., hours, minutes, year, month, day).
- Once all settings are complete, press the ADJUST button to exit the setting mode.
4. Operating Instructions
4.1. Using the Digital Functions
Your watch includes several digital functions accessible via the mode button. These typically include:
- Alarm: Set a daily alarm.
- Stopwatch: Measure elapsed time.
- Dual Time: Display a second time zone.
- Day/Date/Month Display: Automatically updates.
Refer to the specific button layout on your watch for precise operation of each mode. Generally, the MODE button cycles through functions, and the ADJUST, FORWARD, and REVERSE buttons are used for setting and operating within each mode.
4.2. Using the Rotating Bezel

Figure 2: Watch Bezel Detail. This image highlights the rotating bezel and the connection point of the watch strap to the case.
The Casio AMW320R-1EV features a bi-directional rotating bezel. This bezel can be rotated clockwise or counter-clockwise to mark elapsed time or a specific point in time.
- To measure elapsed time, rotate the bezel so that the '0' mark (or triangle) aligns with the minute hand at the start of an event.
- Read the elapsed time by noting the position of the minute hand against the bezel's markings.
Note: Due to its bi-directional nature, this bezel is not suitable for critical dive timing where accidental movement could lead to safety risks. Always use dedicated dive computers or uni-directional bezels for professional diving.
4.3. Water Resistance
This watch is water resistant to 100 meters (330 feet). This rating means it is suitable for recreational swimming, snorkeling, and showering. It is not suitable for scuba diving, high-impact water sports, or prolonged submersion at depths beyond its rating.
- Do not operate the crown or buttons while the watch is wet or submerged.
- Ensure the crown is fully pushed in before any water exposure.
- Avoid exposing the watch to extreme temperature changes (e.g., hot showers followed by cold water), as this can compromise seals.
5. Care and Maintenance
5.1. Cleaning Your Watch
- Wipe the watch case and band regularly with a soft, dry cloth to remove dirt and moisture.
- For stubborn dirt, especially on the resin band, use a mild soap solution and a soft brush, then rinse thoroughly with fresh water and dry completely.
- Avoid using harsh chemicals, solvents, or abrasive cleaners, as these can damage the watch's finish or seals.
5.2. Battery Replacement
When the watch battery runs low, the digital display may dim or the watch may stop functioning. Battery replacement should be performed by a qualified watch technician to ensure proper sealing and maintain water resistance. Attempting to replace the battery yourself may void the warranty and compromise the watch's water resistance.
5.3. Water Resistance Checks
It is recommended to have the watch's water resistance seals checked periodically, especially if the watch has been opened for battery replacement or repair, or if it experiences frequent exposure to water. This helps ensure the watch maintains its specified water resistance rating.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Analog hands not moving / Watch stopped | Low battery; Crown pulled out; Malfunction. | Push crown in fully. If still not working, battery may need replacement by a professional. |
| Digital display blank or dim | Low battery. | Battery replacement required by a professional. |
| Incorrect analog time | Time not set correctly; Accidental crown movement. | Refer to Section 3.1 to reset the analog time. |
| Incorrect digital time/date | Time/date not set correctly. | Refer to Section 3.2 to reset the digital time and date. |
| Moisture inside watch crystal | Compromised water resistance seal; Extreme temperature change. | Stop using the watch immediately and take it to a qualified watch repair center for inspection and repair. |
If you encounter issues not listed here or if the suggested solutions do not resolve the problem, please contact Casio customer support or an authorized service center.
7. Specifications
- Model Number: AMW320R-1EV
- Movement: Quartz
- Case Material: Stainless Steel
- Crystal Material: Mineral
- Case Diameter: 45 mm
- Dial Color: Black
- Functions: Analog Time, Digital Time, Day, Date, Month, Alarm, Stopwatch, Dual Time
- Water Resistance: 100 meters (330 feet)
- Manufacturer: Casio
- ASIN: B00H07RHPW
8. Warranty and Support
Your Casio watch is covered by a limited warranty. For specific warranty terms and conditions, please refer to the warranty card included with your purchase or visit the official Casio website. For technical support, service, or inquiries, please contact Casio customer service through their official channels.
Casio Official Website: www.casio.com





