CASIO SPF51-1AV
Owner's Manual

2345/2347-3
Using the barometric pressure graph
Barometric pressure is affected by changes in weather and temperature. The following shows how to interpret the data that appears on the barometric pressure graph. A rising graph generally means better weather.

THERMOMETER MODE
A built-in temperature sensor measures temperature and shows the measured value on the display. The thermometer can be calibrated to correct for errors. Important! Temperature measurements are affected by your body temperature (while you are wearing the watch), direct sunlight, and moisture. To achieve a more accurate temperature measurement, remove the watch from your wrist, place it in a well-ventilated location out of direct sunlight, and wipe off all moisture from the case. It takes approximately 20 to 30 minutes for the case of the watch to reach the temperature of the surrounding air.

A falling graph generally means deteriorating weather.

About temperature measurements
The watch takes temperature measurements every five seconds for the first two minutes after you enter the Thermometer Mode. The Thermometer Mode indicator 1 flashes on the display during these two minutes. After the first two minutes, the Thermometer Mode indicator 1 stops flashing, and the watch automatically takes measurements every five minutes.

Note that if there are sudden changes in weather or temperature, the graph line of past measurements may run off the top or bottom of the display. The entire graph will become visible once barometric pressure conditions stabilize.

Understanding the temperature display
The display shows �� � . � °C� (or °F) if a measured value falls outside the range of �10.0°C to 60.0°C (14.0°F to 140.0°F). The normal display will return as soon as the temperature returns within the allowable range.
Thermometer Mode indicator 1
A B

C

D

Selecting the unit of measurement
1. Use C to enter the Barometer Mode. 2. Hold down A until �OFF� or the current barometric pressure value flashes on the display. 3. Press C to change to the measurement unit selection screen. 4. Each press of D or B cycles the barometric pressure measurement unit as shown below.
hPa mb inHg
Remaining memory Thermometer Mode indicator 2

M

Temperature graph

Selecting the measurement unit
1. Use C to enter the Thermometer Mode. 2. Hold down A until �OFF� or the current temperature calibration value flashes on the display. 3. Press C to change to the measurement unit selection screen. 4. Each press of D or B toggles the temperature measurement unit as shown below.

5. After you select the measurement unit you want, press A to return to the Barometer Mode screen. � Note that all measurement data currently in memory is also deleted whenever you change the barometric pressure or temperature unit of measurement.

°C

M

°F

Calibrating the barometric pressure measurement
The sensor of this watch is calibrated at the factory before shipment, and further adjustment is normally not required. If noticeable error is found in the barometric pressure readings produced by the watch, you can adjust it to correct the error. Important! Incorrectly calibrating the barometric pressure measurement of this watch can result in incorrect readings. Compare the readings produced by the watch with those of another reliable, accurate barometer.

5. After you select the measurement unit you want, press A to return to the Thermometer Mode screen. � Note that all measurement data currently in memory is also deleted whenever you change the barometric pressure or temperature unit of measurement.

Calibrating the temperature measurement
The temperature sensor of this watch is calibrated at the factory before shipment, and further adjustment is normally not required. If noticeable error is found in the temperature readings produced by the watch, you can adjust it to correct the error. Important! Incorrectly calibrating the temperature measurement of this watch can result in incorrect readings. Carefully read the following before doing anything. � Compare the readings produced by the watch with those of another reliable, accurate thermometer. � If adjustment is required, remove the watch from your wrist and wait for 20 or 30 minutes to give the temperature of the watch time to stabilize.

To calibrate the barometric pressure
1. Use C to enter the Barometer Mode. 2. Hold down A until �OFF� or the current barometric pressure calibration value flashes on the display. � �OFF� appears when the factory setting is currently set as the current barometric pressure calibration value. 3. Each press of D increases the displayed barometric pressure by 1 hPa/mb, while pressing B decreases it. Holding down either button changes the value at high speed. � If inHg is currently selected as the unit of measurement, the above operations change the reading by 0.05 inHg. � Pressing B and D at the same time returns to the �OFF� setting. 4. After calibrating the barometric pressure, press A to return to the Barometer Mode screen.

To calibrate the temperature
1. Use C to enter the Thermometer Mode. 2. Hold down A until �OFF� or the current temperature calibration value flashes on the display. � �OFF� appears when the factory setting is currently set as the current temperature calibration value. 3. Each press of D increases the displayed temperature by 0.1°C, while pressing B decreases it. Holding down either button changes the value at high speed. � If Fahrenheit is currently selected as the unit of measurement, the above operations change the reading by 0.2°F. � Pressing B and D at the same time returns to the �OFF� setting. 4. After calibrating the temperature, press A to return to the Thermometer Mode screen.

M

The following conditions cause the barometric pressure measurement to be skipped, with the corresponding point on the barometric pressure graph being left blank. � Barometric reading that is out of range (460 hPa/mb to 1100 hPa/mb/13.55 inHg to 32.45 inHg). � Sensor malfunction. � Dead battery.

Temperature Unit of measurement

2 seconds later

Press A.