( ( The ( Geiger counter ) ) ( ( ( can also ) ( measure radioactivity ) ) . ) )
(ROOT (S (NP (DT The) (NNP Geiger) (NN counter)) (VP (MD can) (ADVP (RB also)) (VP (VB measure) (NP (NN radioactivity)))) (. .)))
The Geiger counter can also measure radioactivity.
(ROOT (S (NP (NP (DT The) (`` `) (NN counting) ('' ') (NN instrument)) (NP (NN geiger) (NN counter))) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN radioactivity))))))) (. .)))