User manual

Term

Definition

To find the Heat Index temperature, look at the Heat Index chart below. As an

example, if the air temperature is 96°F and the relative humidity is 65%, the heat

index (how hot it feels) is 121°F.

IMPORTANT: Since heat index values were devised for shady, light wind

conditions, exposure to full sunshine can increase heat index values by up to 15°F.

Also, strong winds, particularly with very hot, dry air, can be extremely hazardous.

The Heat Index Chart shaded zone above 105°F shows a level that may cause

increasingly severe heat disorders with continued exposure or physical activity.

Heat Index is not calculated below 80°F.

HectoPascals

(hPa)

Pressure units in SI (international system) units of measurement. Same 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

Rain Gauge

A rain gauge is a device that measures liquid precipitation (rain), as opposed to solid

precipitation (snow gauge) over a set period of time.

All digital rain gauges are self emptying or self dumping (also referred to as tipping

rain gauge). The precision of the rain gauge is based on the volume of rain per

emptying cycle.

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.