Investing in Paint Reading Guage

[maestrodetailer]

Trying to see if anyone tried these products and if so, which is better. I'm trying to buy a reader due to the recent accident I came across on a Porches Cayenne. The owner wanted me to fix his new vehicle after seeing so many scratches and swirls instilled by the dealer. After washing the car, I saw many clear coat failures from over buffing by the dealer''s detailer and told the client I will not be performing any type of paint correction. So now, I am thinking that thi's device is a great investment if I'm working with high end vehicles and other brands.

My question is has anyone either have the....

1. Carfidant milPro $399
2. DBPOWER CEM DT-156 $160
3. CM8801FN $130
4. Or other suggestions like Defelsko

These can be found on amazon with great reviews. Price does not matter but if it's cheaper and performs as good as others, than I will just purchase the cheaper!

[Setec Astronomy]

How about this one from the Autogeek store: HighLine Meter Paint Thickness Gauge 2nd Generation