CASIO PRT-70, 700, 71 User Manual

Important Information

The battery installed at the factory may be discharged during storage and in the store. If you notice the first signs of battery depletion (the indicator dims), replace the battery at your CASIO dealer or distributor.

Notes:

• Class I watches are not waterproof; avoid contact with moisture.
• Do not press buttons underwater.
• For Class IV, buttons can be pressed underwater, but not recessed buttons. If the watch comes into contact with seawater, rinse it thoroughly with fresh water and dry it.
• Class V watches can be used during diving operations (except for depths requiring helium-oxygen gas mixtures).
• Some waterproof watches come with leather straps. Do not wear such models while swimming or in any other situation involving immersion of the strap in water.

Precautions for Use

• Do not attempt to open the case or remove the back cover.
• The gasket for protection against water and dust must be replaced every 2-3 years.
• If water or condensation gets into the watch, take it to your CASIO dealer or distributor for repair immediately.
• Do not expose the watch to excessively high temperatures.
• Although the watch is equipped with an anti-shock mechanism, avoid strong impacts or dropping it onto hard surfaces.
• Do not overtighten the bracelet. A finger should fit under the bracelet.
• Use a soft cloth, dry or dampened with a soapy solution, to clean the watch and bracelet. Do not use volatile chemical solvents (such as gasoline, thinners, cleaning aerosols, etc.).
• Always store the watch in a dry place when not in use.
• Do not expose the watch to aggressive reagents such as gasoline, cleaning agents, aerosols. Chemical reactions with such agents can damage the gasket, case, and polish.
• Some models have specifications printed on their bracelets. Clean such bracelets carefully to avoid erasing the print.
• For watches with plastic bracelets, a whitish powdery residue may appear. This substance is harmless and can be removed with a cloth. If moisture is left on a plastic bracelet or the watch is kept in a humid environment, the bracelet may warp, crack, or break. To preserve the plastic bracelet, wipe off dirt or moisture with a soft cloth as soon as possible.
• For watches with fluorescent bracelets and cases, prolonged exposure to direct sunlight or moisture can cause the fluorescence color to fade. Wipe off moisture promptly and avoid contact with other surfaces. Strong friction on a printed fluorescent surface can transfer the color to another surface.

Information about Sensors

The sensor built into your watch is a highly sensitive instrument; do not attempt to disassemble or repair it yourself. Check for sand, dirt, dust, or other foreign matter around the sensor. Rinse the watch with clean fresh water to clean it. Never insert pins or other thin objects into the sensor openings.

The measurement sensors built into your watch are designed for measurements that do not require professional accuracy. The values obtained should be considered approximate, with acceptable accuracy.

CASIO COMPUTER CO., LTD is not responsible for third-party claims arising from the use of this watch.

1. General Instructions

• Press button "C" to switch between modes.
• Press and hold button "C" for 1 second in any mode to return the watch to the Home Time mode.
• Pressing button "C" after performing an operation in the Data Recall, Alarm, or Timer mode returns the watch to the normal current time display.
• Pressing button "B" in any mode, except Timer or Stopwatch mode, illuminates the display for 1-5 seconds. The backlight cannot be used while in setting mode.
• The backlight on watches with module 2307 illuminates both the digital and analog screens. Watches with module 2335 illuminate only the digital screen.
• If you do not press any button for several minutes while in setting mode (during digit flashing), the flashing will stop, and the watch will automatically exit setting mode.
• If you do not operate the buttons for 10 hours in Barometer or Thermometer modes, the watch will automatically return to the Home Time mode.

2. Current Time Mode

Display Elements: Seconds, Hours, PM Indicator, Day of Week, Month-Date.

Pressing button "D" changes the screen as shown below. The selected screen type will be used until you change it.

3. Auto-Backlight Function

Your watch uses an electro-luminescent backlight that allows you to read the display even in complete darkness. The auto-backlight function automatically turns on the backlight when you tilt the watch towards you.

Note:

• The backlight uses an electro-luminescent source, which loses its luminous capacity with prolonged use.
• Frequent use of the backlight shortens battery life.
• The backlight is difficult to see in bright sunlight.
• The watch emits a sound when the backlight is on. This sound is due to the electro-luminescent source vibrating slightly when activated. This is normal and does not indicate a malfunction.
• The backlight automatically turns off during audible alarms.

4. Barometer Functions

Your watch has a special sensor used to measure atmospheric pressure. You can calibrate this sensor if necessary.

Note:

The barometer built into your watch detects changes in atmospheric pressure, which you can then use to make your own weather forecasts. This barometer is not intended for use as a precise instrument for official weather forecasts.

Examples of Use:

• Before going into the mountains, you can determine the possible nature of approaching weather by analyzing the readings of the watch's built-in barometer.
• You can make a weather forecast when preparing for a game of golf or any other outdoor activity.

5. Altimeter Function

The built-in altimeter uses a special atmospheric pressure measurement sensor. The measured atmospheric pressure is then used to estimate altitude according to the "ISA" (International Standard Atmosphere) values for altitude and atmospheric pressure. If you set a base altitude, the watch will also calculate the relative altitude based on your setting.

The watch has built-in semiconductor pressure sensors that react to temperature changes. When measuring altitude, ensure conditions prevent the watch from being exposed to rapid temperature changes.

Information about Altitude Measurement

• These watches estimate altitude based on atmospheric pressure. This means that altitude readings for the same location can vary if atmospheric pressure changes.
• Sudden weather changes can negatively affect the quality of altitude readings.
• Do not use the watch during sports competitions where sudden changes in altitude occur. Do not use the watch for measurements requiring professional or industrial accuracy. The watch should not be used for activities such as skydiving, hang gliding, paragliding, or flying single-engine aircraft.

Usage

• Before starting a climb, set the base altitude to 0m at the foot of the mountain. This will allow you to determine the difference between the base point's altitude and the altitude at the end of your route.
• To determine the altitude difference between your home and another location, set the base altitude to 0m at your home's level.
• When climbing a mountain, you can enter the altitude of a control point as the base altitude, which will allow you to determine how high you have ascended during the climb. You are likely to get inaccurate readings in the following cases:
• Due to changes in atmospheric pressure caused by weather changes.
• Due to significant temperature fluctuations.
• If your watch is subjected to a strong impact.

The watch measures altitude every five seconds for the first two minutes after you enter Altimeter mode. During the first two minutes after entering this mode, the Altimeter mode indicator flashes. After the first two minutes, the indicator stops flashing, and the watch automatically starts measuring every two minutes (on even minutes).

Display readings change in 5-meter (20-foot) increments within a range of -6000 to 6000 meters (0 to 19680 feet).

Choosing Units

1. Use button "C" to enter Altimeter mode.
2. Press and hold button "A" until the base altitude or "OFF" message flashes on the screen.
3. Press button "C" to go to the unit selection screen.
4. Each press of buttons "D" or "B" switches the altitude measurement units.
5. After selecting the unit of measurement, press button "A" to return to the Altimeter screen.
6. Note that when changing the units for the barometer, altimeter, or thermometer, all current data in memory will be erased.

Setting Base Altitude

After you set the base altitude, the watch automatically calculates the difference between the current value and the set value. Altitude measurements made by your watch may be inaccurate due to changes in atmospheric pressure. Therefore, we recommend setting the reference altitude during a climb each time it is possible.

1. Enter Altimeter mode using button "C".
2. Press and hold button "A" until the current base altitude or the "OFF" message flashes on the screen.
3. Press button "D" to increase the display reading by 5 meters, while pressing button "B" decreases it. Holding these buttons down changes the readings more rapidly. If you selected feet as the unit of measurement, the increment would be 20 feet.
4. You can set the base altitude in the range of -6000m to 6000m (-19680 to 19680 feet).
5. Press buttons "B" and "D" simultaneously to return to the factory setting ("OFF").
6. After setting the desired base altitude, press button "A" to return to the Altimeter screen.

In certain atmospheric conditions, or when a specific base altitude is set, the measured altitude may be negative. The "OFF" message appears when factory-set calibration values are used.

6. Thermometer Mode

The built-in temperature sensor measures temperature and displays the measured value. You can calibrate the thermometer to correct errors.

Attention:

Temperature readings are affected by your body heat (when wearing the watch on your wrist), direct sunlight, and moisture. For more accurate temperature measurements, remove the watch from your wrist, place it in a well-ventilated area away from direct sunlight, and wipe the case dry. It will take approximately 20-30 minutes for the watch case to reach the ambient temperature.

Information about Temperature Measurements

Temperature measurements are taken automatically every 5 seconds for the first two minutes after you enter Thermometer mode. During these two minutes, the Thermometer mode indicator flashes on the screen. After the first two minutes, this indicator stops flashing, and the watch automatically starts measuring temperature every 5 minutes.

Temperature Reading Explanations

If the measured value is outside the range of -10.0 C to 60.0 C (or 14.0 F to 140.0 F), the screen will display "----C". Once the temperature is within the acceptable range, normal indication will be restored.

7. Memory

The watch is equipped with memory that can store up to 10 values of atmospheric pressure, altitude, and temperature. Note that the date and time of measurement are not stored in memory. The number of available lines for data recording is shown on the right side of the screen in Barometer, Altimeter, and Thermometer modes.

8. Data Recall

Use button "C" to enter Data Recall mode.

Each press of button "D" sequentially displays measurement data from memory for Barometer, Altimeter, and Thermometer. An indicator for the current data type appears on the screen.

Note that units of measurement are not indicated on the Data Recall screen.

If memory contains no data, "------" is displayed.

9. Alarm Mode

When the daily alarm is on, a 20-second audible alarm sounds at the set time each day. Press any button to stop the alarm. You can also enable the Hourly Chime, which emits a short beep at the start of each hour.

10. Timer Mode

The countdown timer can be set from 10 seconds to 60 minutes. When the countdown reaches zero, a 10-second audible alarm sounds, which can be stopped by pressing any button.

Auto-Repeat Function

• When the countdown reaches zero with auto-repeat enabled, an alarm sounds, and the countdown immediately restarts from the previously set start value.
• You can stop this countdown by pressing button "D" and force the timer to reset to the start value by pressing button "B".
• If you set the start value to 10 seconds or less with auto-repeat enabled, the 10-second alarm will sound for only 1 second.

11. Stopwatch Mode

The Stopwatch mode allows you to measure elapsed and split times and record the first two finishers in a competition. The measurable range for total time is limited to 59 minutes 59.99 seconds.

• a) Measuring Elapsed Time: D (start) → D (stop) → D (restart) → D (stop) → B (reset)
• b) Measuring Split Time: D (start) → B (split) → B (cancel split) → D (stop) → B (reset)
• c) Split Time and Recording First and Second Place: D (start) → B (split, 1st place) → D (stop, 2nd place) → B (cancel split, record 2nd place time) → B (reset)

12. Battery Replacement

For battery replacement, please contact the dealer where you purchased the watch or a CASIO service center.

Attention CASIO Dealers or Distributors

Please carefully read the battery replacement recommendations.

1. Open and remove the watch back cover.
2. Remove the battery holder.
3. Remove the old battery and insert a new one.
4. Replace the battery holder.
5. Touch the AC contact and the positive pole of the battery with metal tweezers.
6. Close the back cover and screw it on securely.
7. If the display shows "OPEN", the cover was not closed properly. Open it again and close it more carefully.

The absence of the "OPEN" message is not an indication of water-tightness. Other tests are required to verify it.

13. Error Warning Function

Warning messages that appear on the watch screen inform you about sensor malfunctions and battery power reduction.

14. Important for Altitude Measurements

Relationship between Altitude, Atmospheric Pressure, and Temperature

Generally, atmospheric pressure and temperature decrease as altitude increases. The altitude measurements of these watches are based on the "ISA" (International Standard Atmosphere) values established by the International Civil Aviation Organization ("ICAO"), which defines the relationship between altitude, atmospheric pressure, and temperature.

How to Determine Altitude

There are two standard methods of expressing altitude: absolute altitude and relative altitude. Absolute altitude is defined as the absolute height above sea level. Relative altitude is defined as the difference between the altitudes of two different points on the terrain.

Barometer

The pressure measured by the barometer indicates changes in the atmosphere. By observing these changes, you can make weather forecasts with a reasonable degree of accuracy. An increase in atmospheric pressure indicates approaching good weather, while a decrease in pressure indicates worsening weather conditions. The atmospheric pressure values you see in newspapers and television weather reports are measurement results adjusted to values measured at sea level (0 meters above sea level).

15. Specifications

• Timekeeping Accuracy: +/- 20 seconds per month at normal temperature.
• Current Time Mode: Hours, minutes, seconds, AM/PM indicator, year, month, date, day of week, barometric pressure graph, three hands (hour, minute, second).
• Timekeeping System: Switchable between 12-hour and 24-hour format.
• Calendar System: Auto-calendar, programmed from 1995 to 2039.
• Barometer Function:
  • Display range: 460 to 1100 hPa/mb (or 13.55 to 32.45 inches of mercury).
  • Measurement step: 1 hPa/mb (0.05 inch of mercury).
  • Display range: 460 to 1100 hPa/mb (or 13.55 to 32.45 inches of mercury).
  • Measurement interval: every 5 seconds for the first two minutes, then one measurement every two hours.
• Altimeter Mode:
  • Measurement range: 700 to 6000 m (from -2300 to 19680 feet).
  • Display range: -6000 to 6000 m (from -19680 to 19680 feet). Negative values may result from atmospheric conditions or the input of certain base altitudes.
  • Measurement step: 5m (20 feet).
  • Measurement interval: every 5 seconds for the first two minutes, then every 2 minutes.
• Thermometer Mode:
  • Measurement range: -10.0 to 60.0 C (or 14.0 to 140.0 F).
  • Measurement step: 0.1 C (or 0.2 F).
  • Display range: -10.0 to 60.0 C (or 14.0 to 140.0 F).
  • Measurement interval: every 5 seconds for the first two minutes, then one measurement every five minutes.

Measurement accuracy is guaranteed within the range of 10 C to 40 C (or 50 F to 104 F). Accuracy decreases if the watch is subjected to strong impact or extreme temperatures.

Temperature Sensor Accuracy: +/- 2 C (+/- 3.6 F) in the range of 10 to 60 C (14 to 140 F).

• Data Recall Mode: Displays 10 records of atmospheric pressure, altitude, and temperature.
• Alarm Mode: Daily alarm, hourly chime.
• Timer Mode:
  • Step: 1/10 sec.
  • Range: 10 seconds to 60 minutes in 10-second increments (setting 0 minutes 0 seconds sets a start value of 60 minutes).
  • Additional: Auto-repeat.
• Stopwatch Mode:
  • Measurement accuracy: (Time) 1/100 second.
  • Measurement ranges: 59 minutes, 59.99 seconds.
  • Measurement modes: Total elapsed time, split time, two first place finishes in competitions.
• Backlight: Battery: Type: CR1620. Approximate lifespan: 18 months under the following conditions: backlight operates 1.5 seconds per day, alarm sounds 20 seconds per day, 12 barometer readings per day, and 2 altitude readings per month.

Product Information