Sunday, November 09, 2008

JDC Xplorer 4 Handheld Weather Instrument on Sale!

The JDC Xplorer 4 Handheld Weather Instrument is on sale now. Buy now for Christmas - makes a great gift. Only $139.99!

The JDC SKYWATCH Xplorer 4 is simple to use. Press one button, and instant readings are at your fingertips.

Designed for the consumer and professional in Switzerland, the Xplorer 4 is built to demanding specifations and engineered to provide a lifetime of accurate and dependable use.


  • Dimension: 3.5 x 1.5 x 0.75 in, 2 oz. (41 x 93 x 17 mm, 50 g)
  • One button operation
  • EL Backlight
  • Completely sealed; internal sensors
  • Weatherproof (can be submerged 6 feet)
  • Replaceable Lithium battery (included and installed)
  • Stainless steel back
  • Auto-off after one minute (can be disabled to remain on)
  • Included lanyard
  • One year warranty
  • Designed in Switzerland


  • Balanced impeller is integrated into wind meter
  • The impeller is magnatized, producing a magnetic field when rotating which is measured internally
  • Damage to the impeller is unlikely due to the small opening, but repair can be performed
  • Units: km/h, mph, m/s, fps, knots
  • Range: Max 94 mph (150 km/h)
  • Resolution: 0.1 unit
  • Precision: +/- 3%
  • Measuring cycle: Twice per second


  • Internal thermometer is attached to the stainless steel back
  • Temperature adjusts quickly, although drastic temperature changes may require several minutes for accuracy
  • Temperature is read quickly by touching the back to an object of the same temperature
  • Water temperature is read quickly by submerging the unit briefly
  • Units: °F, °C
  • Range: -58°F to 212°F (-50°C to 100°C)
  • Resolution: 0.1 unit
  • Precision: +/- 0.5°F (0.3°C)
  • Measuring cycle: Twice per second


  • Xplorer 3 and 4
  • Designed to be used in verticle position
  • Will display windspeed and compass simultaneously
  • Electronic calibration before use ensures absolute precision (easy process)
  • Calibration is essential for proper use
  • Accurate wind direction can be found in this way....a world exclusive feature!
  • Units: Degrees off North
  • Range: 0 - 359°
  • Resolution: 1 degree
  • Precision: +/- 4 degrees
  • Measuring cycle: Twice per second


  • Altitude is based on an initial set altitude and a change in air pressure (this is true of ALL altimeters)
  • Drastic air pressure variance (weather front) will impact altitude readings (usually occurs over 12+ hours)
  • Several seconds is needed to adjust to new altitude
  • The highest accuracy is acheived when the altitude is properly set, a change in altitude is more than 10 feet, and several seconds are allowed for adjustment
  • For example, the Xplorer 4 may be moved from one level of a house to another, and a change of 10 feet will be recorded (standard ceiling height)
  • Altitude and air pressure are measured on the same sensor, and adjusting one will adjust the other
  • Altitude history is recorded every hour for the past 48 hours
  • See instruction manual for more details
  • Units: feet, meters
  • Range: -2,300 to 29,500 ft (-700 to 9,000 m)
  • Resolution: 3 feet (1 meter)
  • Precision: +/- 33 ft (10 m)
  • Measuring cycle: One second


  • Air pressure is read in either "relative" or "absolute" air pressure
  • Absolute air pressure is a precisely defined measurement, just like temperature
  • Absolute air pressure is measured within .10 inHg, and cannot be adjusted
  • Relative air pressure is the most common unit used in the US
  • Relative air pressure factors out the change in elevation, essentailly calculating the air pressure at sea level
  • Relative air pressure is adjusted to reflect current altitude
  • Once the relative air pressure is set, if no changes to altitude occur the accuracy is within 0.01 inHg
  • The most important factor in changing weather is the change in air pressure
  • Rising air pressure indicates better weather, falling air pressure indicates worsenign weather
  • With the air pressure history, one can accurately predict future weather
  • Air pressure history is recorded every hour for the past 48 hours, although the past 6-12 hours is most important
  • See instruction manual for more detail
  • Units: inHg, hPa
  • Range: 8.86 to 32.50 inHg (300 to 1100 hPa)
  • Resolution: .01 inHg (1 hPa)
  • Precision: +/- 0.10 inHg (3 hPa)
  • Measuring cycle: One second


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