First question would be: Can I socket the pr4 as easily as I did my pm6. Secondly would it be easier to do datalogging with the pm6 or pr4. I allready have the pm6 socket and ready for datalogging I just need some more insight. If I am not mistaken the pm6 logic is almost identical to the pr4. I may need to brush up in my electrical engineering. Help would be much appriciated.