TEMPERATURE:

• 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

DIGITAL COMPASS:

• 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:

• 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:

• 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