Buying a Timegrapher

Probably a subject discussed many times but I would like to hear from those who have timegraphers. The Weishei 1000 timegrapher seems to be mentioned in many articles regarding popular and affordable timegraphers, but I haven't read specifically that it is accurate for measuring time on the co-axial movement. Since coaxial movements have lift angle I believe between 36 to 38 degrees, do I need a more sophisticated machine? What experience do you owners of timegraphers have with measuring co axial movements and non coaxial movements with a single machine? I am not a watch maker, just an enthusiast who would like to reliably evaluate watches that I want to buy or sell. What are your recommendations for an affordable timegrapher that is reliable when measuring both the co-axial movements and non co-axial movements? Thank you.

I own a 1900 and used it on the new 8800 Seamaster 300m Professional Divers today. Works fine.

As long as it's a new 1900 they will work with co-axial movements. I have the Chinese knock off version.