My hair clipper will not cut completely bald even with the guard off:

https://www.johnlewis.com/babyliss-xtp-super-clipper-multi/p4545040

You'd need something like that (very good in my experience) plus something like this for complete hair removal:

https://www.johnlewis.com/philips-s5885-...blue/p110612266

Never used one of those but my father in law did.

I guess the Philips one would be fine on its own if you were using every week without fail