Measurement of UV Intensity

Hints on the use of the UV sensor:
Need enough electricity to give accurate readings. To set proper zero value, you should shield off any light from the sensor and select Calibrate from the lower right menu. It measures the UV-A radiation with wavelength around 280-390 nm. The maximum value is 150 W/m2 and 1 W/m2 = 0.1 mW/cm2.
UV index and exposure level for various UV intensity
UV intensity (W/m2) UV Index Exposure level

0-20

0-2

Low

21-35

3-5

moderate

36-45

6-7

High

46-55

8-10

Very high

>=56

>=11

Extreme

Source: Hong Kong Observatory (2014) for further information on UV index and health.