User's Manual

10  GlossaryofTerms

Term Definition

Accuracy Accuracy is defined as the ability of a measurement to match the

actual value of the quantity being measured.

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.

Range Range is defined as the amount or extent a value can be measured.

Resolution Resolution is defined as the number of significant digits (decimal

places) to which a value is being reliably measured.

Wind Vane A wind vane is a device that measures the direction of the wind. The

wind vane is usually combined with the anemometer. Wind direction

is the direction from which the wind is blowing.

Absolute Barometric

Pressure

Relative barometric pressure, corrected to sea-level. To compare

pressure conditions from one location to another, meteorologists

correct

pressure to sea-level conditions. Because the air pressure decreases

you rise in altitude, the sea-level corrected pressure (the pressure

your

location would be at if located at sea-level) is generally higher than

your

measured pressure.

Relative Barometric

Pressure

Measured barometric pressure relative to your location or ambient

conditions.

HectoPascals (hPa) Pressure units in SI (international system) units of measurement.

Same

as millibars (1 hPa = 1 mbar)

Inches of Mercury (inHg) Pressure in Imperial units of measure.

1 inch of mercury = 33.86 millibars

11 Specifications

11.1WirelessSpecifications

• Line of sight wireless transmission (in open air): 300 feet, 100 feet under most conditions

• Frequency: 433 MHz

• Update Rate: 60 seconds for rain sensor and thermo-hygrometer sensor, 16 seconds for wind

sensor.

433.92 MHz