What is the True Tone?
The screen can automatically adjust the white balance according to the ambient light,
so that the eyes are not easy to be tired when staring at the screen for a long time.
Iphone 8 and above machines have the true tone function,
if the screen is not the original machine, this function will disappear.
Programmer principle:
Read the configuration file from the broken screen of the original machine,
and then write the configuration file to the new screen,
so that the host and the new screen are matched to restore the true tone display function.
How to repair true tone missing for iphone 12 series?
First, you need a “True Tone Programmer”. This tool is only compatible for NCC incell iPhone 12 series screen. 

Repairing process: https://www.bizbee.com/blog/Repair-True-Tone-Missing-for-iPhone-12-Series-BIZEBEE-now-can-do-it-Only-compatible-for-NCC-incell-iPhone-12-series.html
Iphone 12 Series NCC INCELL Promotion
Only 10pcs moq/per model can get the wholesale price,
50pcs can get 1 free true tone repair programmer.
Price is as low as 126.22usd!!!
Don't miss this big profit, contact Krina asap :)
BIZBEE LIMITED
Web: www.bizbee.com
Tel: +(86) 15818991178
Krina Hong-Bizbee Sale manager
Whatsapp/Wechat/Phone: +86 15818991178
Email/Skype: krina.hong@bizbee.com
Add: Xinghe World, Wuhe Blvd South, Longgang District, Shenzhen, China