ECOWITT HP1000SE PRO, Manual

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Without a calibrated source, wind speed can be difficult to measure.
We recommend using a calibrated wind meter (not included) and a
constant speed, high speed fan.
(7) The rain collector is calibrated at the factory based on the funnel
diameter. The bucket tips every 0.01” or 0.1m of rain (referred to as
resolution). The accumulated rainfall can be compared to a sight
glass rain gauge with an aperture of at least 4” or 0.1m.
Make sure you periodically clean the rain gauge funnel.
Note:
The purpose of calibration is to fine tune or correct for any sensor
error associated with the devices margin of error. Errors can occur due to
electronic variation (example, the temperature sensor is a resistive thermal
device or RTD, the humidity sensor is a capacitance device), mechanical
variation, or degradation (wearing of moving parts, contamination of
sensors).
Calibration is only useful if you have a known calibrated source you can
compare it against, and is optional. This section discusses practices,
procedures and sources for sensor calibration to reduce manufacturing and
degradation errors. Do not compare your readings obtained from sources
such as the internet, radio, television or newspapers. The purpose of your
weather station is to measure conditions of your surroundings, which vary
significantly from location to location.
Note
: UV Calibration MUST be performed every 2 to 3 months to improve
results. Over time, UV Index may alter results based on bright and strong
sunlight conditions. This is why diligent UV Calibration is recommended.
4.9.20 More
On the More page, you can set the Calibration for the optional multi-channel
soil moisture/PM2.5/temp and humidity sensor. You can also view or
manage all the sensors ID on the Sensors ID Setup page.