User's Manual

Version 1.0 Page 24
Term Definition
as millibars (1 hPa = 1 mbar)
Hygrometer A hygrometer is a device that measures relative humidity. Relative
humidity is a term used to describe the amount or percentage of water
vapor that exists in air.
Inches of Mercury (inHg) Pressure in Imperial units of measure.
1 inch of mercury = 33.86 millibars
Range Range is defined as the amount or extent a value can be measured.
Relative Barometric
Pressure
Measured barometric pressure relative to your location or ambient
conditions.
Resolution Resolution is defined as the number of significant digits (decimal
places) to which a value is being reliably measured.
Thermometer A thermometer is a device that measures temperature. Most digital
thermometers are resistive thermal devices (RTD). RTDs predict change
in temperature as a function of electrical resistance.
6. Specifications
6.1 Wireless Specifications
 Line of sight wireless transmission (in open air): 300 feet, 100 feet under most conditions
 Update Rate: about one minute
 Frequency: 915 MHz
6.2 Measurement Specifications
The following table provides the specifications for the measured parameters.
Measurement Range Accuracy Resolution
Indoor Temperature 32 to 140 °F ± 2 °F 0.1 °F
Outdoor Temperature -40 to 149 °F Lithium
batteries
-23 to 140 °F Alkaline
batteries
± 2 °F 0.1 °F
Indoor Humidity 1 to 99% ± 5% 1 %
Outdoor Humidity 1 to 99% ± 5% 1 %
Barometric Pressure 8.85 to 32.50 inHg ± 0.08 inHg (within range of
27.13 to 32.50 inHg)
0.01 inHg
6.3 Power Consumption
 ObserverIP Receiver : 5V DC Adaptor (included)
 Indoor Thermo-hygrometer-barometer sensor : 2xAAA batteries (not included)
 Outdoor Thermo-hygrometer sensor: 2xAAA batteries (not included)