Tonino colorimeter - determine quickly and easily the roast degree of a coffee

I see This is 800 euros after delivery.
What cheaper way do you recommend to consistently measure roast degrees ? thanks

That’s a nice gadget!

so the app can convert Tonino numbers into Agtron?

Can you give an example of a situation where the target feature is useful? I just can’t imagine using this during roasting.

Thank you excellent video and informative my question is how to convert your scale to industry standard Agtron?