DH's workplace currently use finger print clock in and out.
The system is a piece of shit and frequently fails to register even though it shows the employee confirmation of a successful read.
Management say, "no fingerprint, equals not in, equals no wages for that day".
Nice eh?
They even dock if the system clocks them in but fails on clock threm out as if the employee showed up to provide a fingerprint then immediately buggered off home. They even stick to it if the employee was working within a manager's view all day. When the system first went on line, the sheer number of workers not getting their full pay was astronomical. It's calmed down a lot after some work on the system but it still happens occasionally and the rule is still in force.
So, no, I wouldn't let an employer chip me as most of them can't be trusted to get it right. I mean, who they hell wants to be chipped by the lowest bidder.