[werk_ag]

... but UV readings are nearly double what is expected. Do I just adjust the multiplier in the calculation code or spend more time levelling everything?  It's a uvm-30a sensor.

The Solar Radiation kit with our solar cell, is sent pre-calibrated, so any adjustment should be minimal, regarding the UV sensor, depending of the UV transparency of the material used to cover the UV sensor, on Config_Options adjust here:

Code:

const byte UV_Transmission = 65;    // UV Transmission percentage of UV sensor cover material.

Don't use the multipliers for UV or Solar readings.