Hey Buffo,
You have a great point
We didn't get a chance to tune them identical so I retract last comment. We were more interested in the differences in color of the 650 and the 635 side by side at the time.
The 650 was on the left at the 635 on the right. the 650 was blood red but shows pink on the camera for some reason. The Scanpro30 is on the left the DT40 on the right parallel to each other.
Again though this was not tuned identical so it is most likely way off.
I am very happy with my Scanpro30's though.
Disclaimer. I was in a restricted area of the venue for both patrons and employees. I took video with permission and acknowledgment of laser contact.