Check griotsgarage.com . They seem to have better quality tools.

Don’t forget the site sponsors are first and foremost Porsche enthusiasts so they should have quality trackside tools (among the Uro brand cr@p they insist on offering) - https://www.pelicanparts.com/cgi-bin/ksearch/pel_search_2016.cgi?description=Tire+pressure+gauge

How does the camber gauge work with non-ferrous wheels? Is there enough magnet to draw to the hub?

Sixto
98 E320s sedan and wagon
02 C320 wagon