Trend Indication; Calibration - Alecto WS-5500 Mode D'emploi

snow
(snow is displayed when the forecast is 'rainy' and the
outside temperature is below 0°C (32°F))
Remarks:
• the accuracy of a weather forecast based on air pressure is 70% to
75%; keep in mind that a correct forecast cannot be guaranteed
• the forecast is based on the next 6 hours and may not show the
actual situation

7.7 Trend indication:

The temperature, humidity and air pressure displays include a built-in
trend indicator. Each half hour, the measurements are compared with
the measurements of 3 hours ago
The trend indications displays as follows:
Air humidity:
: rising increase >3%
: equal remains <= 3%
: falling decrease >3%
storm
storm
Temperature: Air pressure:
increase >1°C/2°F increase >1HPA
remains <= 1°C/2°F remains <= 1HPA
decrease >1°C/2°F decrease >1HPA

7.8 Calibration:

In case the indoor unit shows a measurement that deviates from the
measurement of another sensor or weather station, each display may
be adjusted by several percent.
1. press and hold the TEMP and MAX/MIN buttons for 5 seconds and
then repeatedly press the SET button to choose from the following
measurement values: (in between brackets the values are shown that
are used for increasing/decreasing the corresponding reading)
- indoor temperature (+/- 5°C)
- indoor humidity (+/- 9%)
- outdoor temperature (+/- 5°C)
- outdoor humidity (+/- 9%)
- air pressure (+/- 10hpa)
- wind direction (0-360 arc degrees)
- wind velocity (50% - 150%)
- amount of rainfall (50% - 150%)
2. use the + and - buttons to increase or decrease the reading
3. briefly press the
LIGHT/SNOOZE
mode
You may reset a reading to the standard factory setting by repeating this
instruction, but by pressing the ALARM button in step 2.
55
button to return the display to standby