The concept of the e-leveler is perfectly valid, I’ve used both a BLtouch and a dial indicator to basically do the same trimming setup multiple times, it’s just hilarious how visibly old school and bare bones he designed it to be and then he dares to ask $25 for one when you could literally cobble one together from parts for less than a dollar in five minutes.

It should have been a funny perk on like a PCB business card or ruler you’d get from him, and not product he actually tries to sell. Or at best, a kit costing barely more than the postage.