This is the Apple Watch (Series 2/3/4) Test Cable for Touch Screen Digitizer. This handy testing flex cable makes it both simple and easy to check the functionality of an Apple Watch (Series 2/3/4) replacement digitizer assembly without having to completely install it and close up the watch’s case. This digitizer testing tool is a requirement for anyone who makes multiple repairs. With this testing cable installed in an apple watch body, you can connect, test and quickly swap multiple digitizer assembly replacements without damaging the delicate press-fit connectors on the motherboard.