Solar sensor: Solar Cell + LabJack + Weather Display

But U12 should work well also, not?

Have the problems with volts and mv math conversion been solved?

I do not have any 1 wire system. What would be best for use only with this solar sensor (I have not started or bought anything yet), use the LabJack or start a 1 wire system from 0?
I would need to program something with some of these methods?

And finally, is very difficult to calibrate the sensor without a weather station and no other solar sensors? Will it help if I use a calibrated solar cell?

Thank you, I am very grateful with your help.

Pd: I am writing from Spain so, sorry if I can not answer instantly your answers.