mauro63 have you tried the Davis 7714. Do the same with black paint. Ryan at Scaled Instruments does ship international.
https://www.scaledinstruments.com/shop/davis-instruments/davis-7714-passive-radiation-shield/
Thank you Randy, 7714 was my first solar radiation shield a long time ago, in the past I've bought about four davis 7714, it was my preferred solar radiation shield for a long time but, one day, I've tried the barani meteoshield and, from that moment I left the 7714 due to very poor perfomances compared to barani meteoshield
the performance of 8 davis plates, the same plates of vp2, are better,at least in my field, than the 7714
now I have two davis 7714 yet, in one of them I have a ds18b20 connected to a cabled datalogger, another one for some tests.
I,ve also tested a Vaisala dtr-503 (good but not as the barani pro), a Cometsystem f8110 (not good, similar performances of 7714), two Rika versions with very poor perfomances
I'm also testing the Barani meteoshield standard, but it's not installed at the moment, I'm waiting a new datalogger with two external probe and 0,2 °C accuracy
Try painting plate where sensor is mounted black and plate on bottom black. That should give good results if sensor is sandwiched between 2 black plates. top of sensor plate you can leave white.about these step, do you have some tests to confirm the black sandwiched system superiority?
in my personal knowledge all the inner plates should be black painted
sorry, probably my questions could be ridiculous, in this case please forgive me
Mauro