On your patio or porch, or by the pool, get the time, temperature, and humidity at a glance. The La Crosse Technology WT3181P is a large analog wall clock with a metal case. It features both an analog thermometer and an analog hygrometer on the lower half of its face.
- Accurate to 1 second per million years.
- Sets automatically to WWVB radio signal.
- Pushbutton selection of all four U.S. mainland time zones.
- Automatically adjusts for daylight saving time.
- Manual time-set capability for use anywhere outside the WWVB signal range.
- Analog hygrometer indicates relative humidity from 0 to 100%.
to 1 second per million years.
• Sets automatically to WWVB radio
• Pushbutton selection of all four U.S. mainland time zones.
Automatically adjusts for daylight saving time.
• Manual time-set
capability for use anywhere outside the WWVB signal range
thermometer indicates temperatures from -40° to +130°F and from -35° to +55°C.
Analog hygrometer indicates relative humidity from 0 to 100%.
styled with white face, black hands and dial markings, and pewter-finished
• Low-battery indication via 2-second steps of second
• Powered by one AA (1.5V) alkaline battery (not included),
with normal life of about 1 year.
• Dimensions: Diameter: 18 inches
(457.2 mm) overall Depth: 2.25 inches (57.2 mm)
The NIST (National Institute of Standards and
Technology, Time and Frequency Division) maintains a radio station, WWVB, in
Ft. Collins, Colorado. The WWVB radio station derives its signal from the NIST
atomic clock in Boulder, Colorado. A team of atomic physicists is continually
measuring every second of every day, to an accuracy of ten billionths of a
second per day. These physicists have created an international standard,
measuring a second as 9,192,631,770 vibrations of a Cesium-133 atom in a
WWVB (the station’s identification just like any
other radio station) continuously broadcasts time and frequency signals at 60
kHz. The carrier frequency provides a stable frequency reference traceable to
the national standard. There are no voice announcements on the station, but a
time code is synchronized with the 60 kHz carrier and is broadcast continuously
at a rate of 1 bit per second using pulse width modulation. The time code
contains the year, day of year, hour, minute, second, and flags that indicate
the status of Daylight Saving Time, leap years, and leap
The La Crosse Technology WT3181P Atomic
The La Crosse Technology WT3181P Atomic Wall
Clock maintains its incredible accuracy by automatically tuning into the WWVB
radio signal. The built-in antenna ensures reliable signal reception up to 2000
miles (3200km) from the WWVB transmitter. As a result, the La Crosse Technology
clock will calibrate to the atomic clock not only throughout the mainland U.S.
but also in much of Canada. You need only insert the battery, press the
appropriate time zone button, and wait until the signal is received
(overnight). In all other locations worldwide, the La Crosse clock can be
manually set and will provide the high degree of accuracy of any quality quartz
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