Klaus regarded that statement with a lot of scepticism. "Hands full?" What was he meaning to do? It sounded like he was going to use Klaus as a test subject. And he'd had quite enough of that from dad.
Other options:
no subject
Klaus regarded that statement with a lot of scepticism. "Hands full?" What was he meaning to do? It sounded like he was going to use Klaus as a test subject. And he'd had quite enough of that from dad.