SEAWATCH UV Index Watch:
JDC's Seawatch is a fully functional watch, with a UV sensor on the front. Simply wear the watch when doing your favorite outdoor activity, and an alarm will sound if the UV index reaches a dangerous level.
click for larger image
SEAWATCH UV watch is easy to use:
The UV sensor is on the front of the watch, just below the LCD. Expose this sensor the sun, in particular during the peak times of UV radiation, 11:00 am to 2:00 pm. Adjust the face of the watch slightly until the highest number is reached (the direction of the sun must be perpendicular to the UV sensor for most accurate readings).
It will adjust the reading every ten seconds. The bar graph at the top will show at a glance the level of UV radiation. More bars is a higher level, also moving into the different color bands as shown on the color graph to the right.
The Seawatch also has several normal watch modes, such as time, date, calendar, alarms and timers.
SEAWATCH FEATURES:
• EL backlight
• Weatherproof (can be submerged 6 feet)
• Replaceable Lithium battery (included and installed)
• One year warranty
Why UV is Important:

The Global Solar UV Index, or UVI, is a simple measure of the UV radiation level at the Earth's surface. It has been designed to encourage people to protect themselves. The values of the Index range from zero upward and the higher the Index value, the greater the potential for damage to the skin and eye, and the less time it takes for damage to occur.
Everyone is exposed to ultraviolet (UV) radiation from the sun. Small amounts of UV radiation are beneficial to people, and play an essential role in the production of vitamin D. However, overexposure to UV radiation is responsible for two major public health problems: skin cancer and cataracts. To learn more about the damaging effects of overexposure to UV rays and how you can prevent them, please visit the
US government's EPA website.
DETAILS:

ULTRA-VIOLET INDEX (UVI):
• UVI is measured in several modes
• Bar chart at top shows graphically the UVI
• Numeric reading of UVI shows resolution to 0.1 unit
• Alarms can be set for warning of high UVI
• Calibration is usually not necessary, but can be performed (must have access to professional grade UV monitor)
• UVI is affected by time of day, cloud cover, and position of the sun in relation to the earth
• UVI can drastically change within a short distance
• UVI as reported in newspapers and Television is often a forecasted UVI, not based on real-time data

TIME:
• Current time is displayed in 12- or 24-hour mode.
• Perpetual calendar from year 2000 to 2099
• Month, day, day of week and year are displayed

DAILY ALARM:
• 1 daily alarm can be set

CHRONOGRAPH:
• Elapsed time and lap time (1 lap only)
• Range to 9 hours, 59 minutes, 59.99 seconds
• 1/100 second resolution

TIMER:
• Countdown timer
• Setting limit of 23 hours, 59 minutes, and 59 seconds
• Sounds one beep at the 5,4,3,2, and 1 seconds
• Sounds series of beeps at 0 second
SPECIFICATIONS:

UVI (Index)
Time
Chronograph
Countdown Timer
Units
UVI
12/24 mode
Hours, minutes, seconds
Hours, minutes, seconds
Range
0 to 15 (bar segments)
0 to 25 (numerical)

1/100 second to 10 hours
24 hours to 1 second
Resolution
0.1 unit
1 second
1/100 second
1 second
Precision
+/- 1 UVI unit



Measuring cycle
First five minutes: every 2 seconds
After five minutes: every ten seconds
while in UV mode