I don't want to be bothered by installing an Auto Bed Levelling probe. My bed holds level pretty well. This Dial Indicator adapter helps me fine tune the leveling even further as I like to swap between the Creality Mag bed and the glass bed depending on the project and the finish I want.
Both holders just slide onto the stock fan shroud and is held in place by a snug friction fit. The Dial socket is deep and snug enough to securely hold the Dial Indicator.
This adapter is to fit the digital model in the picture. Amazon link: https://www.amazon.ca/gp/product/B07C9MZ858/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
There are two versions - the Tall and Short. The Tall one allows the dial tip to be closer inline to the nozzle. The Short one allows the dial tip further away - just depends on your preference.
I've used the Short one is good for initial leveling since you can see the surface easier. I then use the Tall version for ongoing bed swap and leveling.